28439310 has 32 divisors (see below), whose sum is σ = 70101792. Its totient is φ = 7378560.

The previous prime is 28439309. The next prime is 28439329. The reversal of 28439310 is 1393482.

It is a super-2 number, since 2×28439310² = 1617588706552200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent 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, 11701 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (2190681).

Almost surely, 2^28439310 is an apocalyptic number.

28439310 is an abundant number, since it is smaller than the sum of its proper divisors (41662482).

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

28439310 is a wasteful number, since it uses less digits than its factorization.

28439310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25668.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28439310 is about 5332.8519574427. The cubic root of 28439310 is about 305.2387631433.

The spelling of 28439310 in words is "twenty-eight million, four hundred thirty-nine thousand, three hundred ten".