28988290 has 16 divisors (see below), whose sum is σ = 52316280. Its totient is φ = 11564800.

The previous prime is 28988269. The next prime is 28988291. The reversal of 28988290 is 9288982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27237961 + 1750329 = 5219^2 + 1323^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28988290.

It is not an unprimeable number, because it can be changed into a prime (28988291) 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, 396 + ... + 7624.

Almost surely, 2^28988290 is an apocalyptic number.

28988290 is a deficient number, since it is larger than the sum of its proper divisors (23327990).

28988290 is a wasteful number, since it uses less digits than its factorization.

28988290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7637.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28988290 is about 5384.0774511517. The cubic root of 28988290 is about 307.1903243232.

The spelling of 28988290 in words is "twenty-eight million, nine hundred eighty-eight thousand, two hundred ninety".