28624531 has 8 divisors (see below), whose sum is σ = 30873024. Its totient is φ = 26382720.

The previous prime is 28624529. The next prime is 28624543. The reversal of 28624531 is 13542682.

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

It is not a de Polignac number, because 28624531 - 2¹ = 28624529 is a prime.

It is a super-2 number, since 2×28624531² = 1638727549939922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28624493 and 28624502.

It is not an unprimeable number, because it can be changed into a prime (28624591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10635 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (3859128).

Almost surely, 2^28624531 is an apocalyptic number.

28624531 is a deficient number, since it is larger than the sum of its proper divisors (2248493).

28624531 is a wasteful number, since it uses less digits than its factorization.

28624531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341.

The product of its digits is 11520, while the sum is 31.

The square root of 28624531 is about 5350.1898097170. The cubic root of 28624531 is about 305.8999879633.

The spelling of 28624531 in words is "twenty-eight million, six hundred twenty-four thousand, five hundred thirty-one".