66912090 has 32 divisors (see below), whose sum is σ = 183530880. Its totient is φ = 15294144.

The previous prime is 66912089. The next prime is 66912137. The reversal of 66912090 is 9021966.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159105 + ... + 159524.

It is an arithmetic number, because the mean of its divisors is an integer number (5735340).

Almost surely, 2^66912090 is an apocalyptic number.

66912090 is an abundant number, since it is smaller than the sum of its proper divisors (116618790).

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

66912090 is a wasteful number, since it uses less digits than its factorization.

66912090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318646.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 66912090 is about 8179.9810513228. The cubic root of 66912090 is about 405.9770951350.

The spelling of 66912090 in words is "sixty-six million, nine hundred twelve thousand, ninety".