660408490 has 16 divisors (see below), whose sum is σ = 1358554752. Its totient is φ = 226425744.

The previous prime is 660408487. The next prime is 660408493. The reversal of 660408490 is 94804066.

It is an interprime number because it is at equal distance from previous prime (660408487) and next prime (660408493).

It is a super-2 number, since 2×660408490² = 872278747328160200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660408493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4717134 + ... + 4717273.

It is an arithmetic number, because the mean of its divisors is an integer number (84909672).

Almost surely, 2^660408490 is an apocalyptic number.

660408490 is an abundant number, since it is smaller than the sum of its proper divisors (698146262).

660408490 is a wasteful number, since it uses less digits than its factorization.

660408490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434421.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 660408490 is about 25698.4141534064. The cubic root of 660408490 is about 870.8383560119.

The spelling of 660408490 in words is "six hundred sixty million, four hundred eight thousand, four hundred ninety".