320561634 has 16 divisors (see below), whose sum is σ = 650693088. Its totient is φ = 105258912.

The previous prime is 320561629. The next prime is 320561653. The reversal of 320561634 is 436165023.

It is a super-2 number, since 2×320561634² = 205519522385499912, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398307 + ... + 399110.

It is an arithmetic number, because the mean of its divisors is an integer number (40668318).

Almost surely, 2^320561634 is an apocalyptic number.

320561634 is an abundant number, since it is smaller than the sum of its proper divisors (330131454).

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

320561634 is a wasteful number, since it uses less digits than its factorization.

320561634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797489.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 320561634 is about 17904.2350855880. The cubic root of 320561634 is about 684.3903033879.

The spelling of 320561634 in words is "three hundred twenty million, five hundred sixty-one thousand, six hundred thirty-four".