231472728 has 40 divisors (see below), whose sum is σ = 648339780. Its totient is φ = 77157360.

The previous prime is 231472721. The next prime is 231472729. The reversal of 231472728 is 827274132.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231472692 and 231472701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231472721) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 177958 + ... + 179253.

Almost surely, 2^231472728 is an apocalyptic number.

It is an amenable number.

231472728 is an abundant number, since it is smaller than the sum of its proper divisors (416867052).

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

231472728 is a wasteful number, since it uses less digits than its factorization.

231472728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357229 (or 357216 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 231472728 is about 15214.2278147792. The cubic root of 231472728 is about 613.9975101315.

The spelling of 231472728 in words is "two hundred thirty-one million, four hundred seventy-two thousand, seven hundred twenty-eight".