66704280 has 64 divisors (see below), whose sum is σ = 204387840. Its totient is φ = 17407872.

The previous prime is 66704257. The next prime is 66704299. The reversal of 66704280 is 8240766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (3193560).

Almost surely, 2^66704280 is an apocalyptic number.

66704280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66704280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102193920).

66704280 is an abundant number, since it is smaller than the sum of its proper divisors (137683560).

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

66704280 is a wasteful number, since it uses less digits than its factorization.

66704280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11888 (or 11884 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66704280 is about 8167.2688213380. The cubic root of 66704280 is about 405.5563759983.

The spelling of 66704280 in words is "sixty-six million, seven hundred four thousand, two hundred eighty".