231273428 has 12 divisors (see below), whose sum is σ = 405816180. Its totient is φ = 115325952.

The previous prime is 231273409. The next prime is 231273431. The reversal of 231273428 is 824372132.

It can be written as a sum of positive squares in 2 ways, for example, as 149768644 + 81504784 = 12238^2 + 9028^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231273394 and 231273403.

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, 76013 + ... + 78996.

It is an arithmetic number, because the mean of its divisors is an integer number (33818015).

Almost surely, 2^231273428 is an apocalyptic number.

It is an amenable number.

231273428 is a deficient number, since it is larger than the sum of its proper divisors (174542752).

231273428 is a wasteful number, since it uses less digits than its factorization.

231273428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155386 (or 155384 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 231273428 is about 15207.6766141314. The cubic root of 231273428 is about 613.8212404947.

The spelling of 231273428 in words is "two hundred thirty-one million, two hundred seventy-three thousand, four hundred twenty-eight".