78398132 has 24 divisors (see below), whose sum is σ = 142205952. Its totient is φ = 37778400.

The previous prime is 78398087. The next prime is 78398137. The reversal of 78398132 is 23189387.

It is a super-2 number, since 2×78398132² = 12292534202178848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78398132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78398137) 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 in 7 ways as a sum of consecutive naturals, for example, 32438 + ... + 34770.

It is an arithmetic number, because the mean of its divisors is an integer number (5925248).

Almost surely, 2^78398132 is an apocalyptic number.

It is an amenable number.

78398132 is a deficient number, since it is larger than the sum of its proper divisors (63807820).

78398132 is a wasteful number, since it uses less digits than its factorization.

78398132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639 (or 2637 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 78398132 is about 8854.2719632955. The cubic root of 78398132 is about 427.9915929871.

The spelling of 78398132 in words is "seventy-eight million, three hundred ninety-eight thousand, one hundred thirty-two".