28403724 has 24 divisors (see below), whose sum is σ = 66362688. Its totient is φ = 9455440.

The previous prime is 28403717. The next prime is 28403729. The reversal of 28403724 is 42730482.

It is a junction number, because it is equal to n+sod(n) for n = 28403691 and 28403700.

It is not an unprimeable number, because it can be changed into a prime (28403729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14779 + ... + 16589.

It is an arithmetic number, because the mean of its divisors is an integer number (2765112).

Almost surely, 2^28403724 is an apocalyptic number.

It is an amenable number.

28403724 is an abundant number, since it is smaller than the sum of its proper divisors (37958964).

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

28403724 is a wasteful number, since it uses less digits than its factorization.

28403724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125 (or 3123 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28403724 is about 5329.5144244105. The cubic root of 28403724 is about 305.1113953040. Note that the first 3 decimals are identical.

The spelling of 28403724 in words is "twenty-eight million, four hundred three thousand, seven hundred twenty-four".