66880072 has 32 divisors (see below), whose sum is σ = 145051200. Its totient is φ = 28315584.

The previous prime is 66880069. The next prime is 66880081. The reversal of 66880072 is 27008866.

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, 2547 + ... + 11842.

It is an arithmetic number, because the mean of its divisors is an integer number (4532850).

Almost surely, 2^66880072 is an apocalyptic number.

It is an amenable number.

66880072 is an abundant number, since it is smaller than the sum of its proper divisors (78171128).

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

66880072 is a wasteful number, since it uses less digits than its factorization.

66880072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14485 (or 14481 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 66880072 is about 8178.0237221471. The cubic root of 66880072 is about 405.9123303145.

The spelling of 66880072 in words is "sixty-six million, eight hundred eighty thousand, seventy-two".