78397936 has 10 divisors (see below), whose sum is σ = 151896032. Its totient is φ = 39198960.

The previous prime is 78397919. The next prime is 78397939. The reversal of 78397936 is 63979387.

It is a super-2 number, since 2×78397936² = 12292472738120192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78397939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2449920 + ... + 2449951.

Almost surely, 2^78397936 is an apocalyptic number.

It is an amenable number.

78397936 is a deficient number, since it is larger than the sum of its proper divisors (73498096).

78397936 is a wasteful number, since it uses less digits than its factorization.

78397936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899879 (or 4899873 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 52.

The square root of 78397936 is about 8854.2608951849. The cubic root of 78397936 is about 427.9912363187.

The spelling of 78397936 in words is "seventy-eight million, three hundred ninety-seven thousand, nine hundred thirty-six".