66920920 has 32 divisors (see below), whose sum is σ = 164261520. Its totient is φ = 24334720.

The previous prime is 66920911. The next prime is 66920923. The reversal of 66920920 is 2902966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66920923) 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, 75607 + ... + 76486.

Almost surely, 2^66920920 is an apocalyptic number.

It is an amenable number.

66920920 is an abundant number, since it is smaller than the sum of its proper divisors (97340600).

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

66920920 is a wasteful number, since it uses less digits than its factorization.

66920920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152115 (or 152111 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 66920920 is about 8180.5207658193. The cubic root of 66920920 is about 405.9949524962.

The spelling of 66920920 in words is "sixty-six million, nine hundred twenty thousand, nine hundred twenty".