66880940 has 24 divisors (see below), whose sum is σ = 160514592. Its totient is φ = 22930560.

The previous prime is 66880939. The next prime is 66880967. The reversal of 66880940 is 4908866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238721 + ... + 239000.

It is an arithmetic number, because the mean of its divisors is an integer number (6688108).

Almost surely, 2^66880940 is an apocalyptic number.

It is an amenable number.

66880940 is an abundant number, since it is smaller than the sum of its proper divisors (93633652).

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

66880940 is a wasteful number, since it uses less digits than its factorization.

66880940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477737 (or 477735 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 66880940 is about 8178.0767910310. The cubic root of 66880940 is about 405.9140863452.

The spelling of 66880940 in words is "sixty-six million, eight hundred eighty thousand, nine hundred forty".