66244880 has 40 divisors (see below), whose sum is σ = 165869592. Its totient is φ = 24459264.

The previous prime is 66244847. The next prime is 66244883. The reversal of 66244880 is 8844266.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 64513024 = 1316^2 + 8032^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×66244880³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66244883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30809 + ... + 32888.

Almost surely, 2^66244880 is an apocalyptic number.

It is an amenable number.

66244880 is an abundant number, since it is smaller than the sum of its proper divisors (99624712).

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

66244880 is a wasteful number, since it uses less digits than its factorization.

66244880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63723 (or 63717 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 66244880 is about 8139.0957728731. The cubic root of 66244880 is about 404.6231926906.

The spelling of 66244880 in words is "sixty-six million, two hundred forty-four thousand, eight hundred eighty".