28745331 has 24 divisors (see below), whose sum is σ = 40877760. Its totient is φ = 17960976.

The previous prime is 28745329. The next prime is 28745333. The reversal of 28745331 is 13354782.

It is an interprime number because it is at equal distance from previous prime (28745329) and next prime (28745333).

It is not a de Polignac number, because 28745331 - 2¹ = 28745329 is a prime.

It is a super-2 number, since 2×28745331² = 1652588108599122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28745292 and 28745301.

It is not an unprimeable number, because it can be changed into a prime (28745333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93480 + ... + 93786.

It is an arithmetic number, because the mean of its divisors is an integer number (1703240).

Almost surely, 2^28745331 is an apocalyptic number.

28745331 is a deficient number, since it is larger than the sum of its proper divisors (12132429).

28745331 is a wasteful number, since it uses less digits than its factorization.

28745331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 392 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 28745331 is about 5361.4672432087. The cubic root of 28745331 is about 306.3296993181.

The spelling of 28745331 in words is "twenty-eight million, seven hundred forty-five thousand, three hundred thirty-one".