28900531 has 8 divisors (see below), whose sum is σ = 32297328. Its totient is φ = 25632000.

The previous prime is 28900523. The next prime is 28900537. The reversal of 28900531 is 13500982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28900531 - 2³ = 28900523 is a prime.

It is a super-2 number, since 2×28900531² = 1670481384163922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28900531.

It is not an unprimeable number, because it can be changed into a prime (28900537) 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, 31590 + ... + 32491.

It is an arithmetic number, because the mean of its divisors is an integer number (4037166).

Almost surely, 2^28900531 is an apocalyptic number.

28900531 is a deficient number, since it is larger than the sum of its proper divisors (3396797).

28900531 is a wasteful number, since it uses less digits than its factorization.

28900531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64133.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 28900531 is about 5375.9214093958. The cubic root of 28900531 is about 306.8800155006.

The spelling of 28900531 in words is "twenty-eight million, nine hundred thousand, five hundred thirty-one".