231387280 has 20 divisors (see below), whose sum is σ = 537975612. Its totient is φ = 92554880.

The previous prime is 231387239. The next prime is 231387281. The reversal of 231387280 is 82783132.

It can be written as a sum of positive squares in 2 ways, for example, as 31899904 + 199487376 = 5648^2 + 14124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (231387281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1446091 + ... + 1446250.

Almost surely, 2^231387280 is an apocalyptic number.

231387280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231387280 is an abundant number, since it is smaller than the sum of its proper divisors (306588332).

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

231387280 is a wasteful number, since it uses less digits than its factorization.

231387280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892354 (or 2892348 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 231387280 is about 15211.4193946522. The cubic root of 231387280 is about 613.9219485786.

The spelling of 231387280 in words is "two hundred thirty-one million, three hundred eighty-seven thousand, two hundred eighty".