660842220 has 48 divisors (see below), whose sum is σ = 1855461888. Its totient is φ = 175738560.

The previous prime is 660842197. The next prime is 660842243. The reversal of 660842220 is 22248066.

It is an interprime number because it is at equal distance from previous prime (660842197) and next prime (660842243).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7015 + ... + 37025.

It is an arithmetic number, because the mean of its divisors is an integer number (38655456).

Almost surely, 2^660842220 is an apocalyptic number.

660842220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660842220 is an abundant number, since it is smaller than the sum of its proper divisors (1194619668).

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

660842220 is a wasteful number, since it uses less digits than its factorization.

660842220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30390 (or 30388 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 660842220 is about 25706.8516158630. The cubic root of 660842220 is about 871.0289582770.

It can be divided in two parts, 6608 and 42220, that added together give a triangular number (48828 = T₃₁₂).

The spelling of 660842220 in words is "six hundred sixty million, eight hundred forty-two thousand, two hundred twenty".