78197388 has 24 divisors (see below), whose sum is σ = 192064320. Its totient is φ = 24693840.

The previous prime is 78197387. The next prime is 78197393. The reversal of 78197388 is 88379187.

It is a super-2 number, since 2×78197388² = 12229662980045088, 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 78197388.

It is not an unprimeable number, because it can be changed into a prime (78197387) 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, 171258 + ... + 171713.

It is an arithmetic number, because the mean of its divisors is an integer number (8002680).

Almost surely, 2^78197388 is an apocalyptic number.

It is an amenable number.

78197388 is an abundant number, since it is smaller than the sum of its proper divisors (113866932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78197388 is a wasteful number, since it uses less digits than its factorization.

78197388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342997 (or 342995 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 78197388 is about 8842.9287003798. The cubic root of 78197388 is about 427.6259797655.

The spelling of 78197388 in words is "seventy-eight million, one hundred ninety-seven thousand, three hundred eighty-eight".