66290224 has 80 divisors (see below), whose sum is σ = 172488960. Its totient is φ = 23834880.

The previous prime is 66290197. The next prime is 66290281. The reversal of 66290224 is 42209266.

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, 13947 + ... + 18085.

It is an arithmetic number, because the mean of its divisors is an integer number (2156112).

Almost surely, 2^66290224 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 66290224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86244480).

66290224 is an abundant number, since it is smaller than the sum of its proper divisors (106198736).

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

66290224 is a wasteful number, since it uses less digits than its factorization.

66290224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 4172 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66290224 is about 8141.8808637808. The cubic root of 66290224 is about 404.7154918966.

The spelling of 66290224 in words is "sixty-six million, two hundred ninety thousand, two hundred twenty-four".