66669528 has 64 divisors (see below), whose sum is σ = 171072000. Its totient is φ = 21644672.

The previous prime is 66669509. The next prime is 66669541. The reversal of 66669528 is 82596666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278833 + ... + 279071.

It is an arithmetic number, because the mean of its divisors is an integer number (2673000).

Almost surely, 2^66669528 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 66669528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85536000).

66669528 is an abundant number, since it is smaller than the sum of its proper divisors (104402472).

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

66669528 is a wasteful number, since it uses less digits than its factorization.

66669528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 500 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 66669528 is about 8165.1410275635. The cubic root of 66669528 is about 405.4859340243.

The spelling of 66669528 in words is "sixty-six million, six hundred sixty-nine thousand, five hundred twenty-eight".