231090328 has 32 divisors (see below), whose sum is σ = 512272800. Its totient is φ = 95622912.

The previous prime is 231090319. The next prime is 231090329. The reversal of 231090328 is 823090132.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 231090296 and 231090305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231090329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69525 + ... + 72772.

It is an arithmetic number, because the mean of its divisors is an integer number (16008525).

Almost surely, 2^231090328 is an apocalyptic number.

231090328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231090328 is an abundant number, since it is smaller than the sum of its proper divisors (281182472).

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

231090328 is a wasteful number, since it uses less digits than its factorization.

231090328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142339 (or 142335 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 231090328 is about 15201.6554361688. The cubic root of 231090328 is about 613.6592095700.

The spelling of 231090328 in words is "two hundred thirty-one million, ninety thousand, three hundred twenty-eight".