78256467009 has 32 divisors (see below), whose sum is σ = 132814080000. Its totient is φ = 44611210512.

The previous prime is 78256467007. The next prime is 78256467019. The reversal of 78256467009 is 90076465287.

78256467009 is a `hidden beast` number, since 7 + 8 + 2 + 564 + 6 + 70 + 0 + 9 = 666.

It is not a de Polignac number, because 78256467009 - 2¹ = 78256467007 is a prime.

It is a super-2 number, since 2×78256467009² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78256467007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414909 + ... + 573290.

It is an arithmetic number, because the mean of its divisors is an integer number (4150440000).

Almost surely, 2^78256467009 is an apocalyptic number.

It is an amenable number.

78256467009 is a deficient number, since it is larger than the sum of its proper divisors (54557612991).

78256467009 is a wasteful number, since it uses less digits than its factorization.

78256467009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988634 (or 988628 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 78256467009 in words is "seventy-eight billion, two hundred fifty-six million, four hundred sixty-seven thousand, nine".