66678792 has 32 divisors (see below), whose sum is σ = 170765280. Its totient is φ = 21683840.

The previous prime is 66678779. The next prime is 66678827. The reversal of 66678792 is 29787666.

It is a super-2 number, since 2×66678792² = 8892122605158528, which contains 22 as substring.

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, 32898 + ... + 34865.

It is an arithmetic number, because the mean of its divisors is an integer number (5336415).

Almost surely, 2^66678792 is an apocalyptic number.

It is an amenable number.

66678792 is an abundant number, since it is smaller than the sum of its proper divisors (104086488).

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

66678792 is a wasteful number, since it uses less digits than its factorization.

66678792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67813 (or 67809 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 51.

The square root of 66678792 is about 8165.7082975086. The cubic root of 66678792 is about 405.5047144569.

The spelling of 66678792 in words is "sixty-six million, six hundred seventy-eight thousand, seven hundred ninety-two".