66249924 has 24 divisors (see below), whose sum is σ = 166474560. Its totient is φ = 20384544.

The previous prime is 66249923. The next prime is 66249977. The reversal of 66249924 is 42994266.

It is not an unprimeable number, because it can be changed into a prime (66249923) 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, 212184 + ... + 212495.

It is an arithmetic number, because the mean of its divisors is an integer number (6936440).

Almost surely, 2^66249924 is an apocalyptic number.

It is an amenable number.

66249924 is an abundant number, since it is smaller than the sum of its proper divisors (100224636).

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

66249924 is a wasteful number, since it uses less digits than its factorization.

66249924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424699 (or 424697 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 66249924 is about 8139.4056294056. The cubic root of 66249924 is about 404.6334620004.

The spelling of 66249924 in words is "sixty-six million, two hundred forty-nine thousand, nine hundred twenty-four".