66724804 has 12 divisors (see below), whose sum is σ = 116829328. Its totient is φ = 33345000.

The previous prime is 66724769. The next prime is 66724829. The reversal of 66724804 is 40842766.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8479 + ... + 14329.

Almost surely, 2^66724804 is an apocalyptic number.

It is an amenable number.

66724804 is a deficient number, since it is larger than the sum of its proper divisors (50104524).

66724804 is a wasteful number, since it uses less digits than its factorization.

66724804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706 (or 8704 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 66724804 is about 8168.5252034869. The cubic root of 66724804 is about 405.5979664605.

It can be divided in two parts, 66724 and 804, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 66724804 in words is "sixty-six million, seven hundred twenty-four thousand, eight hundred four".