66604536 has 24 divisors (see below), whose sum is σ = 180387480. Its totient is φ = 22201488.

The previous prime is 66604529. The next prime is 66604547. The reversal of 66604536 is 63540666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66604536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 462460 + ... + 462603.

It is an arithmetic number, because the mean of its divisors is an integer number (7516145).

Almost surely, 2^66604536 is an apocalyptic number.

It is an amenable number.

66604536 is an abundant number, since it is smaller than the sum of its proper divisors (113782944).

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

66604536 is a wasteful number, since it uses less digits than its factorization.

66604536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925075 (or 925068 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 66604536 is about 8161.1602116366. The cubic root of 66604536 is about 405.3541301320.

The spelling of 66604536 in words is "sixty-six million, six hundred four thousand, five hundred thirty-six".