66188460 has 48 divisors (see below), whose sum is σ = 199586016. Its totient is φ = 16292352.

The previous prime is 66188453. The next prime is 66188461. The reversal of 66188460 is 6488166.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (66188461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41649 + ... + 43208.

It is an arithmetic number, because the mean of its divisors is an integer number (4158042).

Almost surely, 2^66188460 is an apocalyptic number.

66188460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66188460 is an abundant number, since it is smaller than the sum of its proper divisors (133397556).

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

66188460 is a wasteful number, since it uses less digits than its factorization.

66188460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84882 (or 84880 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 66188460 is about 8135.6290475906. The cubic root of 66188460 is about 404.5082890955.

The spelling of 66188460 in words is "sixty-six million, one hundred eighty-eight thousand, four hundred sixty".