66874280 has 96 divisors (see below), whose sum is σ = 169926120. Its totient is φ = 23654400.

The previous prime is 66874273. The next prime is 66874309. The reversal of 66874280 is 8247866.

It can be written as a sum of positive squares in 4 ways, for example, as 28111204 + 38763076 = 5302^2 + 6226^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198272 + ... + 198608.

Almost surely, 2^66874280 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 66874280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84963060).

66874280 is an abundant number, since it is smaller than the sum of its proper divisors (103051840).

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

66874280 is a wasteful number, since it uses less digits than its factorization.

66874280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 66874280 is about 8177.6695946951. The cubic root of 66874280 is about 405.9006122645.

The spelling of 66874280 in words is "sixty-six million, eight hundred seventy-four thousand, two hundred eighty".