66620970 has 48 divisors (see below), whose sum is σ = 186541992. Its totient is φ = 16398720.

The previous prime is 66620951. The next prime is 66620987. The reversal of 66620970 is 7902666.

It can be written as a sum of positive squares in 4 ways, for example, as 42029289 + 24591681 = 6483^2 + 4959^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27301 + ... + 29640.

Almost surely, 2^66620970 is an apocalyptic number.

66620970 is an abundant number, since it is smaller than the sum of its proper divisors (119921022).

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

66620970 is a wasteful number, since it uses less digits than its factorization.

66620970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56967 (or 56964 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 66620970 is about 8162.1669916757. The cubic root of 66620970 is about 405.3874664098.

The spelling of 66620970 in words is "sixty-six million, six hundred twenty thousand, nine hundred seventy".