66690984 has 32 divisors (see below), whose sum is σ = 173977920. Its totient is φ = 21263616.

The previous prime is 66690977. The next prime is 66690991. The reversal of 66690984 is 48909666.

It is an interprime number because it is at equal distance from previous prime (66690977) and next prime (66690991).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59857 + ... + 60960.

It is an arithmetic number, because the mean of its divisors is an integer number (5436810).

Almost surely, 2^66690984 is an apocalyptic number.

It is an amenable number.

66690984 is an abundant number, since it is smaller than the sum of its proper divisors (107286936).

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

66690984 is a wasteful number, since it uses less digits than its factorization.

66690984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120849 (or 120845 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 66690984 is about 8166.4547999729. The cubic root of 66690984 is about 405.5294280229.

The spelling of 66690984 in words is "sixty-six million, six hundred ninety thousand, nine hundred eighty-four".