6604394940 has 864 divisors, whose sum is σ = 26589378816. Its totient is φ = 1358622720.

The previous prime is 6604394939. The next prime is 6604394941. The reversal of 6604394940 is 494934066.

It is a happy number.

6604394940 is a `hidden beast` number, since 6 + 604 + 39 + 4 + 9 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6604394939) and next prime (6604394941).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6604394941) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 153590559 + ... + 153590601.

It is an arithmetic number, because the mean of its divisors is an integer number (30774744).

Almost surely, 2^6604394940 is an apocalyptic number.

6604394940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6604394940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13294689408).

6604394940 is an abundant number, since it is smaller than the sum of its proper divisors (19984983876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6604394940 is a wasteful number, since it uses less digits than its factorization.

6604394940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 6604394940 is about 81267.4285307466. The cubic root of 6604394940 is about 1876.1937230522.

The spelling of 6604394940 in words is "six billion, six hundred four million, three hundred ninety-four thousand, nine hundred forty".