66274428 has 24 divisors (see below), whose sum is σ = 168698880. Its totient is φ = 20083120.

The previous prime is 66274399. The next prime is 66274447. The reversal of 66274428 is 82447266.

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, 250908 + ... + 251171.

It is an arithmetic number, because the mean of its divisors is an integer number (7029120).

Almost surely, 2^66274428 is an apocalyptic number.

It is an amenable number.

66274428 is an abundant number, since it is smaller than the sum of its proper divisors (102424452).

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

66274428 is a wasteful number, since it uses less digits than its factorization.

66274428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502097 (or 502095 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The square root of 66274428 is about 8140.9107598597. The cubic root of 66274428 is about 404.6833433968.

The spelling of 66274428 in words is "sixty-six million, two hundred seventy-four thousand, four hundred twenty-eight".