78740339728 has 40 divisors (see below), whose sum is σ = 153409700000. Its totient is φ = 39151309824.

The previous prime is 78740339707. The next prime is 78740339737. The reversal of 78740339728 is 82793304787.

It is a super-2 number, since 2×78740339728² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2242048 + ... + 2276896.

It is an arithmetic number, because the mean of its divisors is an integer number (3835242500).

Almost surely, 2^78740339728 is an apocalyptic number.

It is an amenable number.

78740339728 is a deficient number, since it is larger than the sum of its proper divisors (74669360272).

78740339728 is a wasteful number, since it uses less digits than its factorization.

78740339728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35639 (or 35633 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 78740339728 in words is "seventy-eight billion, seven hundred forty million, three hundred thirty-nine thousand, seven hundred twenty-eight".