28039970 has 32 divisors (see below), whose sum is σ = 61077888. Its totient is φ = 9047808.

The previous prime is 28039961. The next prime is 28039981. The reversal of 28039970 is 7993082.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10592 + ... + 12971.

It is an arithmetic number, because the mean of its divisors is an integer number (1908684).

Almost surely, 2^28039970 is an apocalyptic number.

28039970 is an abundant number, since it is smaller than the sum of its proper divisors (33037918).

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

28039970 is a wasteful number, since it uses less digits than its factorization.

28039970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23594.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 28039970 is about 5295.2780852378. The cubic root of 28039970 is about 303.8033195136.

The spelling of 28039970 in words is "twenty-eight million, thirty-nine thousand, nine hundred seventy".