66874860 has 72 divisors (see below), whose sum is σ = 218465520. Its totient is φ = 16460928.

The previous prime is 66874853. The next prime is 66874861. The reversal of 66874860 is 6847866.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (66874861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11950 + ... + 16629.

Almost surely, 2^66874860 is an apocalyptic number.

66874860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66874860 is an abundant number, since it is smaller than the sum of its proper divisors (151590660).

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

66874860 is a wasteful number, since it uses less digits than its factorization.

66874860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28607 (or 28602 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66874860 is about 8177.7050570438. The cubic root of 66874860 is about 405.9017857185.

The spelling of 66874860 in words is "sixty-six million, eight hundred seventy-four thousand, eight hundred sixty".