28390710 has 32 divisors (see below), whose sum is σ = 70489440. Its totient is φ = 7309568.

The previous prime is 28390673. The next prime is 28390721. The reversal of 28390710 is 1709382.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15447 + ... + 17186.

It is an arithmetic number, because the mean of its divisors is an integer number (2202795).

Almost surely, 2^28390710 is an apocalyptic number.

28390710 is an abundant number, since it is smaller than the sum of its proper divisors (42098730).

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

28390710 is a wasteful number, since it uses less digits than its factorization.

28390710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32672.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 28390710 is about 5328.2933477803. The cubic root of 28390710 is about 305.0647896044.

The spelling of 28390710 in words is "twenty-eight million, three hundred ninety thousand, seven hundred ten".