66231928 has 32 divisors (see below), whose sum is σ = 144828000. Its totient is φ = 28383936.

The previous prime is 66231923. The next prime is 66231959. The reversal of 66231928 is 82913266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66231923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9325 + ... + 14812.

It is an arithmetic number, because the mean of its divisors is an integer number (4525875).

Almost surely, 2^66231928 is an apocalyptic number.

It is an amenable number.

66231928 is an abundant number, since it is smaller than the sum of its proper divisors (78596072).

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

66231928 is a wasteful number, since it uses less digits than its factorization.

66231928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24164 (or 24146 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 66231928 is about 8138.3000681961. The cubic root of 66231928 is about 404.5968207347.

The spelling of 66231928 in words is "sixty-six million, two hundred thirty-one thousand, nine hundred twenty-eight".