78991192 has 32 divisors (see below), whose sum is σ = 171659520. Its totient is φ = 33374880.

The previous prime is 78991153. The next prime is 78991219. The reversal of 78991192 is 29119987.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5958 + ... + 13909.

It is an arithmetic number, because the mean of its divisors is an integer number (5364360).

Almost surely, 2^78991192 is an apocalyptic number.

It is an amenable number.

78991192 is an abundant number, since it is smaller than the sum of its proper divisors (92668328).

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

78991192 is a wasteful number, since it uses less digits than its factorization.

78991192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951 (or 19947 counting only the distinct ones).

The product of its digits is 81648, while the sum is 46.

The square root of 78991192 is about 8887.6989147923. The cubic root of 78991192 is about 429.0680953916.

The spelling of 78991192 in words is "seventy-eight million, nine hundred ninety-one thousand, one hundred ninety-two".