66642280 has 32 divisors (see below), whose sum is σ = 151052040. Its totient is φ = 26460160.

The previous prime is 66642271. The next prime is 66642311. The reversal of 66642280 is 8224666.

It can be written as a sum of positive squares in 4 ways, for example, as 47858724 + 18783556 = 6918^2 + 4334^2 .

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, 601 + ... + 11560.

Almost surely, 2^66642280 is an apocalyptic number.

It is an amenable number.

66642280 is an abundant number, since it is smaller than the sum of its proper divisors (84409760).

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

66642280 is a wasteful number, since it uses less digits than its factorization.

66642280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12309 (or 12305 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 66642280 is about 8163.4723004369. The cubic root of 66642280 is about 405.4306854642.

The spelling of 66642280 in words is "sixty-six million, six hundred forty-two thousand, two hundred eighty".