66731504 has 20 divisors (see below), whose sum is σ = 147762864. Its totient is φ = 28599168.

The previous prime is 66731503. The next prime is 66731507. The reversal of 66731504 is 40513766.

It is a super-2 number, since 2×66731504² = 8906187252204032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297797 + ... + 298020.

Almost surely, 2^66731504 is an apocalyptic number.

It is an amenable number.

66731504 is an abundant number, since it is smaller than the sum of its proper divisors (81031360).

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

66731504 is a wasteful number, since it uses less digits than its factorization.

66731504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595832 (or 595826 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66731504 is about 8168.9353039426. The cubic root of 66731504 is about 405.6115416992.

The spelling of 66731504 in words is "sixty-six million, seven hundred thirty-one thousand, five hundred four".