78393412 has 6 divisors (see below), whose sum is σ = 137188478. Its totient is φ = 39196704.

The previous prime is 78393391. The next prime is 78393437. The reversal of 78393412 is 21439387.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 12068676 = 8144^2 + 3474^2 .

It is a super-2 number, since 2×78393412² = 12291054090003488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9799173 + ... + 9799180.

Almost surely, 2^78393412 is an apocalyptic number.

It is an amenable number.

78393412 is a deficient number, since it is larger than the sum of its proper divisors (58795066).

78393412 is a wasteful number, since it uses less digits than its factorization.

78393412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19598357 (or 19598355 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 78393412 is about 8854.0054212769. The cubic root of 78393412 is about 427.9830036631.

The spelling of 78393412 in words is "seventy-eight million, three hundred ninety-three thousand, four hundred twelve".