78923166 has 32 divisors (see below), whose sum is σ = 188241408. Its totient is φ = 21568800.

The previous prime is 78923161. The next prime is 78923167. The reversal of 78923166 is 66132987.

It is a happy number.

It is a super-2 number, since 2×78923166² = 12457732262927112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78923161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39885 + ... + 41816.

It is an arithmetic number, because the mean of its divisors is an integer number (5882544).

Almost surely, 2^78923166 is an apocalyptic number.

78923166 is an abundant number, since it is smaller than the sum of its proper divisors (109318242).

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

78923166 is a wasteful number, since it uses less digits than its factorization.

78923166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81736.

The product of its digits is 108864, while the sum is 42.

The square root of 78923166 is about 8883.8711156792. The cubic root of 78923166 is about 428.9448910688.

The spelling of 78923166 in words is "seventy-eight million, nine hundred twenty-three thousand, one hundred sixty-six".