66872280 has 32 divisors (see below), whose sum is σ = 200617200. Its totient is φ = 17832576.

The previous prime is 66872279. The next prime is 66872317. The reversal of 66872280 is 8227866.

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, 278515 + ... + 278754.

Almost surely, 2^66872280 is an apocalyptic number.

66872280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66872280 is an abundant number, since it is smaller than the sum of its proper divisors (133744920).

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

66872280 is a wasteful number, since it uses less digits than its factorization.

66872280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557283 (or 557279 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 66872280 is about 8177.5473095544. The cubic root of 66872280 is about 405.8965658193.

The spelling of 66872280 in words is "sixty-six million, eight hundred seventy-two thousand, two hundred eighty".