28902990 has 32 divisors (see below), whose sum is σ = 73019520. Its totient is φ = 7301664.

The previous prime is 28902989. The next prime is 28903001. The reversal of 28902990 is 9920982.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 24784 + ... + 25923.

It is an arithmetic number, because the mean of its divisors is an integer number (2281860).

Almost surely, 2^28902990 is an apocalyptic number.

28902990 is an abundant number, since it is smaller than the sum of its proper divisors (44116530).

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

28902990 is a wasteful number, since it uses less digits than its factorization.

28902990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50736.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 28902990 is about 5376.1501095115. The cubic root of 28902990 is about 306.8887188765. Note that the first 3 decimals are identical.

It can be divided in two parts, 28902 and 990, that added together give a palindrome (29892).

The spelling of 28902990 in words is "twenty-eight million, nine hundred two thousand, nine hundred ninety".