61400040 has 64 divisors (see below), whose sum is σ = 198374400. Its totient is φ = 15113472.

The previous prime is 61400033. The next prime is 61400063. The reversal of 61400040 is 4000416.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 61399992 and 61400019.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18120 + ... + 21239.

It is an arithmetic number, because the mean of its divisors is an integer number (3099600).

Almost surely, 2^61400040 is an apocalyptic number.

61400040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61400040 is an abundant number, since it is smaller than the sum of its proper divisors (136974360).

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

61400040 is a wasteful number, since it uses less digits than its factorization.

61400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39386 (or 39382 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 61400040 is about 7835.8177620463. The cubic root of 61400040 is about 394.5083666086.

Adding to 61400040 its reverse (4000416), we get a palindrome (65400456).

The spelling of 61400040 in words is "sixty-one million, four hundred thousand, forty".