28530408 has 32 divisors (see below), whose sum is σ = 71501760. Its totient is φ = 9486720.

The previous prime is 28530407. The next prime is 28530413. The reversal of 28530408 is 80403582.

It is not an unprimeable number, because it can be changed into a prime (28530407) 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, 10468 + ... + 12908.

It is an arithmetic number, because the mean of its divisors is an integer number (2234430).

Almost surely, 2^28530408 is an apocalyptic number.

It is an amenable number.

28530408 is an abundant number, since it is smaller than the sum of its proper divisors (42971352).

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

28530408 is a wasteful number, since it uses less digits than its factorization.

28530408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937 (or 2933 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28530408 is about 5341.3863368979. The cubic root of 28530408 is about 305.5643336664.

The spelling of 28530408 in words is "twenty-eight million, five hundred thirty thousand, four hundred eight".