66228760 has 32 divisors (see below), whose sum is σ = 160478640. Its totient is φ = 24453504.

The previous prime is 66228733. The next prime is 66228769. The reversal of 66228760 is 6782266.

It is a super-2 number, since 2×66228760² = 8772497302275200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66228769) 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, 63162 + ... + 64201.

Almost surely, 2^66228760 is an apocalyptic number.

It is an amenable number.

66228760 is an abundant number, since it is smaller than the sum of its proper divisors (94249880).

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

66228760 is a wasteful number, since it uses less digits than its factorization.

66228760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127387 (or 127383 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 66228760 is about 8138.1054306270. The cubic root of 66228760 is about 404.5903697515.

It can be divided in two parts, 66 and 228760, that added together give a triangular number (228826 = T₆₇₆).

The spelling of 66228760 in words is "sixty-six million, two hundred twenty-eight thousand, seven hundred sixty".