66407880 has 128 divisors (see below), whose sum is σ = 248417280. Its totient is φ = 13797120.

The previous prime is 66407857. The next prime is 66407903. The reversal of 66407880 is 8870466.

It is an interprime number because it is at equal distance from previous prime (66407857) and next prime (66407903).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5647 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (1940760).

Almost surely, 2^66407880 is an apocalyptic number.

66407880 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 66407880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124208640).

66407880 is an abundant number, since it is smaller than the sum of its proper divisors (182009400).

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

66407880 is a wasteful number, since it uses less digits than its factorization.

66407880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219 (or 7215 counting only the distinct ones).

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

The square root of 66407880 is about 8149.1030181241. The cubic root of 66407880 is about 404.9547884297.

The spelling of 66407880 in words is "sixty-six million, four hundred seven thousand, eight hundred eighty".