320661630 has 96 divisors (see below), whose sum is σ = 879488064. Its totient is φ = 80898048.

The previous prime is 320661623. The next prime is 320661641. The reversal of 320661630 is 36166023.

320661630 is a `hidden beast` number, since 3 + 20 + 6 + 6 + 1 + 630 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 320661594 and 320661603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 199992 + ... + 201588.

It is an arithmetic number, because the mean of its divisors is an integer number (9161334).

Almost surely, 2^320661630 is an apocalyptic number.

320661630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 320661630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439744032).

320661630 is an abundant number, since it is smaller than the sum of its proper divisors (558826434).

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

320661630 is a wasteful number, since it uses less digits than its factorization.

320661630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1727 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 320661630 is about 17907.0273915019. The cubic root of 320661630 is about 684.4614588962.

The spelling of 320661630 in words is "three hundred twenty million, six hundred sixty-one thousand, six hundred thirty".