28408730 has 24 divisors (see below), whose sum is σ = 59485428. Its totient is φ = 9739968.

The previous prime is 28408729. The next prime is 28408801. The reversal of 28408730 is 3780482.

It can be written as a sum of positive squares in 2 ways, for example, as 27489049 + 919681 = 5243^2 + 959^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28499 + ... + 29478.

Almost surely, 2^28408730 is an apocalyptic number.

28408730 is an abundant number, since it is smaller than the sum of its proper divisors (31076698).

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

28408730 is a wasteful number, since it uses less digits than its factorization.

28408730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57998 (or 57991 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28408730 is about 5329.9840525090. The cubic root of 28408730 is about 305.1293189857.

The spelling of 28408730 in words is "twenty-eight million, four hundred eight thousand, seven hundred thirty".