78179966 has 8 divisors (see below), whose sum is σ = 117510264. Its totient is φ = 39009880.

The previous prime is 78179951. The next prime is 78179971. The reversal of 78179966 is 66997187.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78179966² = 12224214167522312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38825 + ... + 40788.

It is an arithmetic number, because the mean of its divisors is an integer number (14688783).

Almost surely, 2^78179966 is an apocalyptic number.

78179966 is a deficient number, since it is larger than the sum of its proper divisors (39330298).

78179966 is a wasteful number, since it uses less digits than its factorization.

78179966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80106.

The product of its digits is 1143072, while the sum is 53.

The square root of 78179966 is about 8841.9435646242. The cubic root of 78179966 is about 427.5942197398.

The spelling of 78179966 in words is "seventy-eight million, one hundred seventy-nine thousand, nine hundred sixty-six".