78420661936 has 20 divisors (see below), whose sum is σ = 153033130600. Its totient is φ = 38928241152.

The previous prime is 78420661877. The next prime is 78420661951. The reversal of 78420661936 is 63916602487.

It is a super-2 number, since 2×78420661936² (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 3 ways as a sum of consecutive naturals, for example, 17628321 + ... + 17632768.

It is an arithmetic number, because the mean of its divisors is an integer number (7651656530).

Almost surely, 2^78420661936 is an apocalyptic number.

It is an amenable number.

78420661936 is a deficient number, since it is larger than the sum of its proper divisors (74612468664).

78420661936 is a wasteful number, since it uses less digits than its factorization.

78420661936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35261236 (or 35261230 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 78420661936 in words is "seventy-eight billion, four hundred twenty million, six hundred sixty-one thousand, nine hundred thirty-six".