66883904 has 14 divisors (see below), whose sum is σ = 132722874. Its totient is φ = 33441920.

The previous prime is 66883897. The next prime is 66883907. The reversal of 66883904 is 40938866.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 15618304 = 7160^2 + 3952^2 .

It is a super-2 number, since 2×66883904² = 8946913228562432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66883907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522467 + ... + 522594.

Almost surely, 2^66883904 is an apocalyptic number.

66883904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66883904 is a deficient number, since it is larger than the sum of its proper divisors (65838970).

66883904 is a wasteful number, since it uses less digits than its factorization.

66883904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045073 (or 1045063 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 66883904 is about 8178.2580052234. The cubic root of 66883904 is about 405.9200826304.

The spelling of 66883904 in words is "sixty-six million, eight hundred eighty-three thousand, nine hundred four".