66988584 has 48 divisors (see below), whose sum is σ = 195386100. Its totient is φ = 20611584.

The previous prime is 66988529. The next prime is 66988639. The reversal of 66988584 is 48588966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66988529) and next prime (66988639).

It can be written as a sum of positive squares in 2 ways, for example, as 66879684 + 108900 = 8178^2 + 330^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66988584.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34849 + ... + 36720.

Almost surely, 2^66988584 is an apocalyptic number.

It is an amenable number.

66988584 is an abundant number, since it is smaller than the sum of its proper divisors (128397516).

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

66988584 is a wasteful number, since it uses less digits than its factorization.

66988584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71594 (or 71587 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 66988584 is about 8184.6553989768. The cubic root of 66988584 is about 406.1317407576.

It can be divided in two parts, 669 and 88584, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 66988584 in words is "sixty-six million, nine hundred eighty-eight thousand, five hundred eighty-four".