230721528 has 32 divisors (see below), whose sum is σ = 577838160. Its totient is φ = 76769280.

The previous prime is 230721511. The next prime is 230721539. The reversal of 230721528 is 825127032.

230721528 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 230721495 and 230721504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5518 + ... + 22178.

Almost surely, 2^230721528 is an apocalyptic number.

It is an amenable number.

230721528 is an abundant number, since it is smaller than the sum of its proper divisors (347116632).

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

230721528 is a wasteful number, since it uses less digits than its factorization.

230721528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17247 (or 17243 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 230721528 is about 15189.5203347571. The cubic root of 230721528 is about 613.3325869031.

The spelling of 230721528 in words is "two hundred thirty million, seven hundred twenty-one thousand, five hundred twenty-eight".