66864072 has 32 divisors (see below), whose sum is σ = 182357280. Its totient is φ = 20261760.

The previous prime is 66864041. The next prime is 66864073. The reversal of 66864072 is 27046866.

It is a self number, because there is not a number n which added to its sum of digits gives 66864072.

It is not an unprimeable number, because it can be changed into a prime (66864073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126373 + ... + 126900.

It is an arithmetic number, because the mean of its divisors is an integer number (5698665).

Almost surely, 2^66864072 is an apocalyptic number.

It is an amenable number.

66864072 is an abundant number, since it is smaller than the sum of its proper divisors (115493208).

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

66864072 is a wasteful number, since it uses less digits than its factorization.

66864072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253293 (or 253289 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 66864072 is about 8177.0454321839. The cubic root of 66864072 is about 405.8799583634.

The spelling of 66864072 in words is "sixty-six million, eight hundred sixty-four thousand, seventy-two".