231128628 has 12 divisors (see below), whose sum is σ = 539300160. Its totient is φ = 77042872.

The previous prime is 231128543. The next prime is 231128663. The reversal of 231128628 is 826821132.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9630348 + ... + 9630371.

It is an arithmetic number, because the mean of its divisors is an integer number (44941680).

Almost surely, 2^231128628 is an apocalyptic number.

It is an amenable number.

231128628 is an abundant number, since it is smaller than the sum of its proper divisors (308171532).

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

231128628 is a wasteful number, since it uses less digits than its factorization.

231128628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19260726 (or 19260724 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 231128628 is about 15202.9151152008. The cubic root of 231128628 is about 613.6931095167.

The spelling of 231128628 in words is "two hundred thirty-one million, one hundred twenty-eight thousand, six hundred twenty-eight".