66988580 has 12 divisors (see below), whose sum is σ = 140676060. Its totient is φ = 26795424.

The previous prime is 66988529. The next prime is 66988639. The reversal of 66988580 is 8588966.

It can be written as a sum of positive squares in 2 ways, for example, as 52911076 + 14077504 = 7274^2 + 3752^2 .

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, 1674695 + ... + 1674734.

It is an arithmetic number, because the mean of its divisors is an integer number (11723005).

Almost surely, 2^66988580 is an apocalyptic number.

It is an amenable number.

66988580 is an abundant number, since it is smaller than the sum of its proper divisors (73687480).

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

66988580 is a wasteful number, since it uses less digits than its factorization.

66988580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349438 (or 3349436 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 66988580 is about 8184.6551546171. The cubic root of 66988580 is about 406.1317326740.

The spelling of 66988580 in words is "sixty-six million, nine hundred eighty-eight thousand, five hundred eighty".