78197928 has 16 divisors (see below), whose sum is σ = 195494880. Its totient is φ = 26065968.

The previous prime is 78197923. The next prime is 78197929. The reversal of 78197928 is 82979187.

It is a super-2 number, since 2×78197928² = 12229831886986368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78197923) 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 3 ways as a sum of consecutive naturals, for example, 1629100 + ... + 1629147.

It is an arithmetic number, because the mean of its divisors is an integer number (12218430).

Almost surely, 2^78197928 is an apocalyptic number.

It is an amenable number.

78197928 is an abundant number, since it is smaller than the sum of its proper divisors (117296952).

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

78197928 is a wasteful number, since it uses less digits than its factorization.

78197928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258256 (or 3258252 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 78197928 is about 8842.9592331979. The cubic root of 78197928 is about 427.6269641015.

The spelling of 78197928 in words is "seventy-eight million, one hundred ninety-seven thousand, nine hundred twenty-eight".