320557398 has 64 divisors (see below), whose sum is σ = 777584640. Its totient is φ = 86056992.

The previous prime is 320557397. The next prime is 320557411. The reversal of 320557398 is 893755023.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320557397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99765 + ... + 102927.

It is an arithmetic number, because the mean of its divisors is an integer number (12149760).

Almost surely, 2^320557398 is an apocalyptic number.

320557398 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 320557398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388792320).

320557398 is an abundant number, since it is smaller than the sum of its proper divisors (457027242).

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

320557398 is a wasteful number, since it uses less digits than its factorization.

320557398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 320557398 is about 17904.1167891633. The cubic root of 320557398 is about 684.3872887933.

The spelling of 320557398 in words is "three hundred twenty million, five hundred fifty-seven thousand, three hundred ninety-eight".