78123892 has 36 divisors (see below), whose sum is σ = 171750880. Its totient is φ = 30436560.

The previous prime is 78123889. The next prime is 78123907. The reversal of 78123892 is 29832187.

It is a super-2 number, since 2×78123892² = 12206685002455328, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8142 + ... + 14917.

Almost surely, 2^78123892 is an apocalyptic number.

It is an amenable number.

78123892 is an abundant number, since it is smaller than the sum of its proper divisors (93626988).

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

78123892 is a wasteful number, since it uses less digits than its factorization.

78123892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23092 (or 23079 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 78123892 is about 8838.7720866645. The cubic root of 78123892 is about 427.4919656960.

The spelling of 78123892 in words is "seventy-eight million, one hundred twenty-three thousand, eight hundred ninety-two".