66983790 has 16 divisors (see below), whose sum is σ = 160761168. Its totient is φ = 17862336.

The previous prime is 66983783. The next prime is 66983827. The reversal of 66983790 is 9738966.

It is a happy number.

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, 1116367 + ... + 1116426.

It is an arithmetic number, because the mean of its divisors is an integer number (10047573).

Almost surely, 2^66983790 is an apocalyptic number.

66983790 is an abundant number, since it is smaller than the sum of its proper divisors (93777378).

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

66983790 is a wasteful number, since it uses less digits than its factorization.

66983790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232803.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 66983790 is about 8184.3625286274. The cubic root of 66983790 is about 406.1220523306.

The spelling of 66983790 in words is "sixty-six million, nine hundred eighty-three thousand, seven hundred ninety".