66749984 has 24 divisors (see below), whose sum is σ = 150187968. Its totient is φ = 28607040.

The previous prime is 66749951. The next prime is 66749987. The reversal of 66749984 is 48994766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66749987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148772 + ... + 149219.

It is an arithmetic number, because the mean of its divisors is an integer number (6257832).

Almost surely, 2^66749984 is an apocalyptic number.

It is an amenable number.

66749984 is an abundant number, since it is smaller than the sum of its proper divisors (83437984).

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

66749984 is a wasteful number, since it uses less digits than its factorization.

66749984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298008 (or 298000 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 53.

The square root of 66749984 is about 8170.0663399999. The cubic root of 66749984 is about 405.6489803352.

The spelling of 66749984 in words is "sixty-six million, seven hundred forty-nine thousand, nine hundred eighty-four".