66574944 has 72 divisors (see below), whose sum is σ = 190243872. Its totient is φ = 22083840.

The previous prime is 66574913. The next prime is 66574961. The reversal of 66574944 is 44947566.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 66574944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77622 + ... + 78474.

It is an arithmetic number, because the mean of its divisors is an integer number (2642276).

Almost surely, 2^66574944 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 66574944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95121936).

66574944 is an abundant number, since it is smaller than the sum of its proper divisors (123668928).

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

66574944 is a wasteful number, since it uses less digits than its factorization.

66574944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1129 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 66574944 is about 8159.3470326981. The cubic root of 66574944 is about 405.2940890945.

The spelling of 66574944 in words is "sixty-six million, five hundred seventy-four thousand, nine hundred forty-four".