28515790 has 16 divisors (see below), whose sum is σ = 51403968. Its totient is φ = 11389536.

The previous prime is 28515779. The next prime is 28515797. The reversal of 28515790 is 9751582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515797) 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, 6859 + ... + 10201.

It is an arithmetic number, because the mean of its divisors is an integer number (3212748).

Almost surely, 2^28515790 is an apocalyptic number.

28515790 is a deficient number, since it is larger than the sum of its proper divisors (22888178).

28515790 is a wasteful number, since it uses less digits than its factorization.

28515790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 28515790 is about 5340.0177902325. The cubic root of 28515790 is about 305.5121378652.

The spelling of 28515790 in words is "twenty-eight million, five hundred fifteen thousand, seven hundred ninety".