78087157506 has 12 divisors (see below), whose sum is σ = 169188841302. Its totient is φ = 26029052496.

The previous prime is 78087157493. The next prime is 78087157531. The reversal of 78087157506 is 60575178087.

It is a happy number.

78087157506 is a `hidden beast` number, since 7 + 8 + 0 + 87 + 1 + 57 + 506 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71124089481 + 6963068025 = 266691^2 + 83445^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2169087691 + ... + 2169087726.

Almost surely, 2^78087157506 is an apocalyptic number.

78087157506 is an abundant number, since it is smaller than the sum of its proper divisors (91101683796).

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

78087157506 is a wasteful number, since it uses less digits than its factorization.

78087157506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338175425 (or 4338175422 counting only the distinct ones).

The product of its (nonzero) digits is 3292800, while the sum is 54.

The spelling of 78087157506 in words is "seventy-eight billion, eighty-seven million, one hundred fifty-seven thousand, five hundred six".