66878280 has 96 divisors (see below), whose sum is σ = 248414400. Its totient is φ = 15285888.

The previous prime is 66878269. The next prime is 66878291. The reversal of 66878280 is 8287866.

It is an interprime number because it is at equal distance from previous prime (66878269) and next prime (66878291).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 10750 + ... + 15789.

It is an arithmetic number, because the mean of its divisors is an integer number (2587650).

Almost surely, 2^66878280 is an apocalyptic number.

66878280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66878280 is an abundant number, since it is smaller than the sum of its proper divisors (181536120).

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

66878280 is a wasteful number, since it uses less digits than its factorization.

66878280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26563 (or 26556 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 66878280 is about 8177.9141594908. The cubic root of 66878280 is about 405.9087049127.

The spelling of 66878280 in words is "sixty-six million, eight hundred seventy-eight thousand, two hundred eighty".