66390060 has 48 divisors (see below), whose sum is σ = 202793472. Its totient is φ = 16094400.

The previous prime is 66390059. The next prime is 66390061. The reversal of 66390060 is 6009366.

It is an interprime number because it is at equal distance from previous prime (66390059) and next prime (66390061).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66390061) 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, 49636 + ... + 50955.

It is an arithmetic number, because the mean of its divisors is an integer number (4224864).

Almost surely, 2^66390060 is an apocalyptic number.

66390060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66390060 is an abundant number, since it is smaller than the sum of its proper divisors (136403412).

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

66390060 is a wasteful number, since it uses less digits than its factorization.

66390060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100614 (or 100612 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 66390060 is about 8148.0095728957. The cubic root of 66390060 is about 404.9185631107.

The spelling of 66390060 in words is "sixty-six million, three hundred ninety thousand, sixty".