66739568 has 40 divisors (see below), whose sum is σ = 150808800. Its totient is φ = 28600320.

The previous prime is 66739567. The next prime is 66739597. The reversal of 66739568 is 86593766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66739567) 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, 593 + ... + 11568.

It is an arithmetic number, because the mean of its divisors is an integer number (3770220).

Almost surely, 2^66739568 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 66739568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75404400).

66739568 is an abundant number, since it is smaller than the sum of its proper divisors (84069232).

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

66739568 is a wasteful number, since it uses less digits than its factorization.

66739568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190 (or 12170 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 66739568 is about 8169.4288662060. The cubic root of 66739568 is about 405.6278794085.

The spelling of 66739568 in words is "sixty-six million, seven hundred thirty-nine thousand, five hundred sixty-eight".