79542900040 has 32 divisors (see below), whose sum is σ = 189499263480. Its totient is φ = 29945562112.

The previous prime is 79542900013. The next prime is 79542900043. The reversal of 79542900040 is 4000924597.

It can be written as a sum of positive squares in 4 ways, for example, as 61443502884 + 18099397156 = 247878^2 + 134534^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 79542899966 and 79542900002.

It is not an unprimeable number, because it can be changed into a prime (79542900043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58486747 + ... + 58488106.

Almost surely, 2^79542900040 is an apocalyptic number.

It is an amenable number.

79542900040 is an abundant number, since it is smaller than the sum of its proper divisors (109956363440).

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

79542900040 is a wasteful number, since it uses less digits than its factorization.

79542900040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116974881 (or 116974877 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 79542900040 in words is "seventy-nine billion, five hundred forty-two million, nine hundred thousand, forty".