66722480 has 40 divisors (see below), whose sum is σ = 169234704. Its totient is φ = 24262400.

The previous prime is 66722479. The next prime is 66722527. The reversal of 66722480 is 8422766.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 66722480.

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, 37031 + ... + 38790.

Almost surely, 2^66722480 is an apocalyptic number.

It is an amenable number.

66722480 is an abundant number, since it is smaller than the sum of its proper divisors (102512224).

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

66722480 is a wasteful number, since it uses less digits than its factorization.

66722480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75845 (or 75839 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 66722480 is about 8168.3829489073. The cubic root of 66722480 is about 405.5932574640.

The spelling of 66722480 in words is "sixty-six million, seven hundred twenty-two thousand, four hundred eighty".