660432840 has 64 divisors (see below), whose sum is σ = 1983864960. Its totient is φ = 175887360.

The previous prime is 660432827. The next prime is 660432859. The reversal of 660432840 is 48234066.

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, 102597 + ... + 108843.

It is an arithmetic number, because the mean of its divisors is an integer number (30997890).

Almost surely, 2^660432840 is an apocalyptic number.

660432840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660432840 is an abundant number, since it is smaller than the sum of its proper divisors (1323432120).

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

660432840 is a wasteful number, since it uses less digits than its factorization.

660432840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142 (or 7138 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 660432840 is about 25698.8879136822. The cubic root of 660432840 is about 870.8490588086.

The spelling of 660432840 in words is "six hundred sixty million, four hundred thirty-two thousand, eight hundred forty".