28624728 has 48 divisors (see below), whose sum is σ = 78666840. Its totient is φ = 8673280.

The previous prime is 28624723. The next prime is 28624741. The reversal of 28624728 is 82742682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28624723) 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 11 ways as a sum of consecutive naturals, for example, 2025 + ... + 7832.

Almost surely, 2^28624728 is an apocalyptic number.

It is an amenable number.

28624728 is an abundant number, since it is smaller than the sum of its proper divisors (50042112).

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

28624728 is a wasteful number, since it uses less digits than its factorization.

28624728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9888 (or 9873 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The square root of 28624728 is about 5350.2082202471. The cubic root of 28624728 is about 305.9006897175.

The spelling of 28624728 in words is "twenty-eight million, six hundred twenty-four thousand, seven hundred twenty-eight".