660698400 has 144 divisors (see below), whose sum is σ = 2263917600. Its totient is φ = 166901760.

The previous prime is 660698393. The next prime is 660698429. The reversal of 660698400 is 4896066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38356 + ... + 52844.

It is an arithmetic number, because the mean of its divisors is an integer number (15721650).

Almost surely, 2^660698400 is an apocalyptic number.

660698400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660698400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1131958800).

660698400 is an abundant number, since it is smaller than the sum of its proper divisors (1603219200).

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

660698400 is a wasteful number, since it uses less digits than its factorization.

660698400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14531 (or 14518 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 660698400 is about 25704.0541549383. The cubic root of 660698400 is about 870.9657659498.

The spelling of 660698400 in words is "six hundred sixty million, six hundred ninety-eight thousand, four hundred".