231039280 has 80 divisors (see below), whose sum is σ = 564249600. Its totient is φ = 87863040.

The previous prime is 231039257. The next prime is 231039287. The reversal of 231039280 is 82930132.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (231039287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145531 + ... + 147109.

It is an arithmetic number, because the mean of its divisors is an integer number (7053120).

Almost surely, 2^231039280 is an apocalyptic number.

231039280 is a gapful number since it is divisible by the number (20) 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 231039280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282124800).

231039280 is an abundant number, since it is smaller than the sum of its proper divisors (333210320).

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

231039280 is a wasteful number, since it uses less digits than its factorization.

231039280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1676 counting only the distinct ones).

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

The square root of 231039280 is about 15199.9763157710. The cubic root of 231039280 is about 613.6140203396.

The spelling of 231039280 in words is "two hundred thirty-one million, thirty-nine thousand, two hundred eighty".