66747872 has 24 divisors (see below), whose sum is σ = 131616576. Its totient is φ = 33321472.

The previous prime is 66747871. The next prime is 66747973. The reversal of 66747872 is 27874766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66747871) 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, 26408 + ... + 28824.

It is an arithmetic number, because the mean of its divisors is an integer number (5484024).

Almost surely, 2^66747872 is an apocalyptic number.

It is an amenable number.

66747872 is a deficient number, since it is larger than the sum of its proper divisors (64868704).

66747872 is a wasteful number, since it uses less digits than its factorization.

66747872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 3282 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The square root of 66747872 is about 8169.9370866611. The cubic root of 66747872 is about 405.6447019837.

The spelling of 66747872 in words is "sixty-six million, seven hundred forty-seven thousand, eight hundred seventy-two".