78297793936 has 20 divisors (see below), whose sum is σ = 151957815372. Its totient is φ = 39082873856.

The previous prime is 78297793921. The next prime is 78297793969. The reversal of 78297793936 is 63939779287.

It can be written as a sum of positive squares in 2 ways, for example, as 53705281536 + 24592512400 = 231744^2 + 156820^2 .

It is a super-2 number, since 2×78297793936² (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, 4116661 + ... + 4135636.

Almost surely, 2^78297793936 is an apocalyptic number.

It is an amenable number.

78297793936 is a deficient number, since it is larger than the sum of its proper divisors (73660021436).

78297793936 is a wasteful number, since it uses less digits than its factorization.

78297793936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8252898 (or 8252892 counting only the distinct ones).

The product of its digits is 216040608, while the sum is 70.

The spelling of 78297793936 in words is "seventy-eight billion, two hundred ninety-seven million, seven hundred ninety-three thousand, nine hundred thirty-six".