66407970 has 64 divisors (see below), whose sum is σ = 169413120. Its totient is φ = 16627968.

The previous prime is 66407963. The next prime is 66407989. The reversal of 66407970 is 7970466.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31159 + ... + 33221.

It is an arithmetic number, because the mean of its divisors is an integer number (2647080).

Almost surely, 2^66407970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66407970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84706560).

66407970 is an abundant number, since it is smaller than the sum of its proper divisors (103005150).

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

66407970 is a wasteful number, since it uses less digits than its factorization.

66407970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 66407970 is about 8149.1085402024. The cubic root of 66407970 is about 404.9549713694.

The spelling of 66407970 in words is "sixty-six million, four hundred seven thousand, nine hundred seventy".