28430624 has 12 divisors (see below), whose sum is σ = 55972854. Its totient is φ = 14215296.

The previous prime is 28430621. The next prime is 28430639. The reversal of 28430624 is 42603482.

It can be written as a sum of positive squares in only one way, i.e., 28430224 + 400 = 5332^2 + 20^2 .

It is not an unprimeable number, because it can be changed into a prime (28430621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444197 + ... + 444260.

Almost surely, 2^28430624 is an apocalyptic number.

It is an amenable number.

28430624 is a deficient number, since it is larger than the sum of its proper divisors (27542230).

28430624 is an equidigital number, since it uses as much as digits as its factorization.

28430624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888467 (or 888459 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 28430624 is about 5332.0375092454. The cubic root of 28430624 is about 305.2076844021.

The spelling of 28430624 in words is "twenty-eight million, four hundred thirty thousand, six hundred twenty-four".