78564998940 has 48 divisors (see below), whose sum is σ = 222117762048. Its totient is φ = 20747260224.

The previous prime is 78564998881. The next prime is 78564999041. The reversal of 78564998940 is 4989946587.

It is a super-2 number, since 2×78564998940² (a number of 23 digits) contains 22 as substring.

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, 6350212 + ... + 6362571.

It is an arithmetic number, because the mean of its divisors is an integer number (4627453376).

Almost surely, 2^78564998940 is an apocalyptic number.

It is an amenable number.

78564998940 is an abundant number, since it is smaller than the sum of its proper divisors (143552763108).

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

78564998940 is a wasteful number, since it uses less digits than its factorization.

78564998940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12712898 (or 12712896 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 69.

The spelling of 78564998940 in words is "seventy-eight billion, five hundred sixty-four million, nine hundred ninety-eight thousand, nine hundred forty".