660349400 has 96 divisors (see below), whose sum is σ = 1577577600. Its totient is φ = 256972800.

The previous prime is 660349373. The next prime is 660349429. The reversal of 660349400 is 4943066.

It is a super-3 number, since 3×660349400³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1378361 + ... + 1378839.

It is an arithmetic number, because the mean of its divisors is an integer number (16433100).

Almost surely, 2^660349400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660349400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788788800).

660349400 is an abundant number, since it is smaller than the sum of its proper divisors (917228200).

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

660349400 is a wasteful number, since it uses less digits than its factorization.

660349400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 660349400 is about 25697.2644458510. The cubic root of 660349400 is about 870.8123825051.

The spelling of 660349400 in words is "six hundred sixty million, three hundred forty-nine thousand, four hundred".