66947620 has 24 divisors (see below), whose sum is σ = 140745024. Its totient is φ = 26749536.

The previous prime is 66947609. The next prime is 66947627. The reversal of 66947620 is 2674966.

It is not an unprimeable number, because it can be changed into a prime (66947627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31099 + ... + 33181.

It is an arithmetic number, because the mean of its divisors is an integer number (5864376).

Almost surely, 2^66947620 is an apocalyptic number.

It is an amenable number.

66947620 is an abundant number, since it is smaller than the sum of its proper divisors (73797404).

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

66947620 is a wasteful number, since it uses less digits than its factorization.

66947620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699 (or 3697 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66947620 is about 8182.1525285221. The cubic root of 66947620 is about 406.0489397192.

The spelling of 66947620 in words is "sixty-six million, nine hundred forty-seven thousand, six hundred twenty".