66669428 has 24 divisors (see below), whose sum is σ = 134639232. Its totient is φ = 28293984.

The previous prime is 66669419. The next prime is 66669431. The reversal of 66669428 is 82496666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8675 + ... + 14442.

It is an arithmetic number, because the mean of its divisors is an integer number (5609968).

Almost surely, 2^66669428 is an apocalyptic number.

It is an amenable number.

66669428 is an abundant number, since it is smaller than the sum of its proper divisors (67969804).

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

66669428 is a wasteful number, since it uses less digits than its factorization.

66669428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23231 (or 23229 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 66669428 is about 8165.1349039682. The cubic root of 66669428 is about 405.4857312900.

The spelling of 66669428 in words is "sixty-six million, six hundred sixty-nine thousand, four hundred twenty-eight".