231405328 has 160 divisors (see below), whose sum is σ = 591962112. Its totient is φ = 85017600.

The previous prime is 231405311. The next prime is 231405329. The reversal of 231405328 is 823504132.

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 = 231405296 and 231405305.

It is not an unprimeable number, because it can be changed into a prime (231405329) 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, 2787975 + ... + 2788057.

Almost surely, 2^231405328 is an apocalyptic number.

231405328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231405328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295981056).

231405328 is an abundant number, since it is smaller than the sum of its proper divisors (360556784).

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

231405328 is a wasteful number, since it uses less digits than its factorization.

231405328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 231405328 is about 15212.0126216093. The cubic root of 231405328 is about 613.9379099504.

The spelling of 231405328 in words is "two hundred thirty-one million, four hundred five thousand, three hundred twenty-eight".