66038644 has 24 divisors (see below), whose sum is σ = 132292160. Its totient is φ = 28256256.

The previous prime is 66038633. The next prime is 66038663. The reversal of 66038644 is 44683066.

It is a super-2 number, since 2×66038644² = 8722205002717472, which contains 22 as substring.

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, 19999 + ... + 23065.

Almost surely, 2^66038644 is an apocalyptic number.

It is an amenable number.

66038644 is an abundant number, since it is smaller than the sum of its proper divisors (66253516).

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

66038644 is a wasteful number, since it uses less digits than its factorization.

66038644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847 (or 3845 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 66038644 is about 8126.4164303831. The cubic root of 66038644 is about 404.2028602488.

It can be divided in two parts, 660 and 38644, that added together give a cube (39304 = 34³).

The spelling of 66038644 in words is "sixty-six million, thirty-eight thousand, six hundred forty-four".