66753984 has 56 divisors (see below), whose sum is σ = 192682368. Its totient is φ = 20227840.

The previous prime is 66753949. The next prime is 66754003. The reversal of 66753984 is 48935766.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 13692 + ... + 17915.

Almost surely, 2^66753984 is an apocalyptic number.

66753984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66753984 is an abundant number, since it is smaller than the sum of its proper divisors (125928384).

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

66753984 is a wasteful number, since it uses less digits than its factorization.

66753984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31633 (or 31623 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 66753984 is about 8170.3111323866. The cubic root of 66753984 is about 405.6570830264.

The spelling of 66753984 in words is "sixty-six million, seven hundred fifty-three thousand, nine hundred eighty-four".