28732293 has 8 divisors (see below), whose sum is σ = 42566400. Its totient is φ = 19154844.

The previous prime is 28732279. The next prime is 28732309. The reversal of 28732293 is 39223782.

It is not a de Polignac number, because 28732293 - 2¹² = 28728197 is a prime.

It is a super-2 number, since 2×28732293² = 1651089322075698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532053 + ... + 532106.

It is an arithmetic number, because the mean of its divisors is an integer number (5320800).

Almost surely, 2^28732293 is an apocalyptic number.

It is an amenable number.

28732293 is a deficient number, since it is larger than the sum of its proper divisors (13834107).

28732293 is a wasteful number, since it uses less digits than its factorization.

28732293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064168 (or 1064162 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 28732293 is about 5360.2512067999. The cubic root of 28732293 is about 306.2833783972.

The spelling of 28732293 in words is "twenty-eight million, seven hundred thirty-two thousand, two hundred ninety-three".