28530624 has 56 divisors (see below), whose sum is σ = 79936848. Its totient is φ = 8949760.

The previous prime is 28530599. The next prime is 28530637. The reversal of 28530624 is 42603582.

It is a junction number, because it is equal to n+sod(n) for n = 28530591 and 28530600.

It is a congruent number.

It is an unprimeable number.

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, 1107 + ... + 7634.

Almost surely, 2^28530624 is an apocalyptic number.

28530624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28530624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39968424).

28530624 is an abundant number, since it is smaller than the sum of its proper divisors (51406224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28530624 is a wasteful number, since it uses less digits than its factorization.

28530624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8773 (or 8763 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 28530624 is about 5341.4065563295. The cubic root of 28530624 is about 305.5651047937.

The spelling of 28530624 in words is "twenty-eight million, five hundred thirty thousand, six hundred twenty-four".