15604406040 has 64 divisors (see below), whose sum is σ = 46826760960. Its totient is φ = 4159971200.

The previous prime is 15604406023. The next prime is 15604406071. The reversal of 15604406040 is 4060440651.

It is a super-2 number, since 2×15604406040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15604405989 and 15604406007.

It is a congruent number.

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, 445237 + ... + 479003.

It is an arithmetic number, because the mean of its divisors is an integer number (731668140).

Almost surely, 2^15604406040 is an apocalyptic number.

15604406040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15604406040 is an abundant number, since it is smaller than the sum of its proper divisors (31222354920).

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

15604406040 is a wasteful number, since it uses less digits than its factorization.

15604406040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37632 (or 37628 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 15604406040 its reverse (4060440651), we get a palindrome (19664846691).

The spelling of 15604406040 in words is "fifteen billion, six hundred four million, four hundred six thousand, forty".