66857912 has 32 divisors (see below), whose sum is σ = 137274480. Its totient is φ = 30274560.

The previous prime is 66857909. The next prime is 66857933. The reversal of 66857912 is 21975866.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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, 24488 + ... + 27080.

Almost surely, 2^66857912 is an apocalyptic number.

It is an amenable number.

66857912 is an abundant number, since it is smaller than the sum of its proper divisors (70416568).

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

66857912 is a wasteful number, since it uses less digits than its factorization.

66857912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903 (or 2899 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 66857912 is about 8176.6687593420. The cubic root of 66857912 is about 405.8674937854.

The spelling of 66857912 in words is "sixty-six million, eight hundred fifty-seven thousand, nine hundred twelve".