642969600 has 624 divisors, whose sum is σ = 2730158592. Its totient is φ = 129761280.

The previous prime is 642969599. The next prime is 642969601. The reversal of 642969600 is 6969246.

It is an interprime number because it is at equal distance from previous prime (642969599) and next prime (642969601).

It is a tau number, because it is divible by the number of its divisors (624).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642969601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27955189 + ... + 27955211.

Almost surely, 2^642969600 is an apocalyptic number.

642969600 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 642969600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365079296).

642969600 is an abundant number, since it is smaller than the sum of its proper divisors (2087188992).

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

642969600 is a wasteful number, since it uses less digits than its factorization.

642969600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 642969600 is about 25356.8452296416. The cubic root of 642969600 is about 863.1046967224.

The spelling of 642969600 in words is "six hundred forty-two million, nine hundred sixty-nine thousand, six hundred".