78190923 has 4 divisors (see below), whose sum is σ = 104254568. Its totient is φ = 52127280.

The previous prime is 78190913. The next prime is 78190933. The reversal of 78190923 is 32909187.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78190913) and next prime (78190933).

It is not a de Polignac number, because 78190923 - 2⁴ = 78190907 is a prime.

It is a super-2 number, since 2×78190923² = 12227640879183858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78190913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13031818 + ... + 13031823.

It is an arithmetic number, because the mean of its divisors is an integer number (26063642).

Almost surely, 2^78190923 is an apocalyptic number.

78190923 is a deficient number, since it is larger than the sum of its proper divisors (26063645).

78190923 is a wasteful number, since it uses less digits than its factorization.

78190923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26063644.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 78190923 is about 8842.5631465090. The cubic root of 78190923 is about 427.6141947250.

The spelling of 78190923 in words is "seventy-eight million, one hundred ninety thousand, nine hundred twenty-three".