66604450 has 72 divisors (see below), whose sum is σ = 138780180. Its totient is φ = 23760000.

The previous prime is 66604427. The next prime is 66604501. The reversal of 66604450 is 5440666.

It can be written as a sum of positive squares in 6 ways, for example, as 49406841 + 17197609 = 7029^2 + 4147^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 610996 + ... + 611104.

Almost surely, 2^66604450 is an apocalyptic number.

66604450 is an abundant number, since it is smaller than the sum of its proper divisors (72175730).

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

66604450 is a wasteful number, since it uses less digits than its factorization.

66604450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66604450 is about 8161.1549427762. The cubic root of 66604450 is about 405.3539556670.

The spelling of 66604450 in words is "sixty-six million, six hundred four thousand, four hundred fifty".