28058531 has 4 divisors (see below), whose sum is σ = 28124064. Its totient is φ = 27993000.

The previous prime is 28058521. The next prime is 28058549. The reversal of 28058531 is 13585082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28058531 - 2⁶ = 28058467 is a prime.

It is a super-2 number, since 2×28058531² = 1574562323755922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28058501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32120 + ... + 32981.

It is an arithmetic number, because the mean of its divisors is an integer number (7031016).

Almost surely, 2^28058531 is an apocalyptic number.

28058531 is a deficient number, since it is larger than the sum of its proper divisors (65533).

28058531 is an equidigital number, since it uses as much as digits as its factorization.

28058531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65532.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 28058531 is about 5297.0303944758. The cubic root of 28058531 is about 303.8703387205.

The spelling of 28058531 in words is "twenty-eight million, fifty-eight thousand, five hundred thirty-one".