66249684 has 96 divisors (see below), whose sum is σ = 180028800. Its totient is φ = 21047040.

The previous prime is 66249671. The next prime is 66249691. The reversal of 66249684 is 48694266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235624 + ... + 235904.

It is an arithmetic number, because the mean of its divisors is an integer number (1875300).

Almost surely, 2^66249684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66249684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90014400).

66249684 is an abundant number, since it is smaller than the sum of its proper divisors (113779116).

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

66249684 is a wasteful number, since it uses less digits than its factorization.

66249684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 382 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 66249684 is about 8139.3908863010. The cubic root of 66249684 is about 404.6329733853.

The spelling of 66249684 in words is "sixty-six million, two hundred forty-nine thousand, six hundred eighty-four".