28539930 has 16 divisors (see below), whose sum is σ = 68495904. Its totient is φ = 7610640.

The previous prime is 28539877. The next prime is 28539947. The reversal of 28539930 is 3993582.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475636 + ... + 475695.

It is an arithmetic number, because the mean of its divisors is an integer number (4280994).

Almost surely, 2^28539930 is an apocalyptic number.

28539930 is an abundant number, since it is smaller than the sum of its proper divisors (39955974).

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

28539930 is a wasteful number, since it uses less digits than its factorization.

28539930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951341.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 28539930 is about 5342.2776041685. The cubic root of 28539930 is about 305.5983238329.

The spelling of 28539930 in words is "twenty-eight million, five hundred thirty-nine thousand, nine hundred thirty".