28408990 has 16 divisors (see below), whose sum is σ = 53827920. Its totient is φ = 10765440.

The previous prime is 28408973. The next prime is 28408999. The reversal of 28408990 is 9980482.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28408999) 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, 74571 + ... + 74950.

It is an arithmetic number, because the mean of its divisors is an integer number (3364245).

Almost surely, 2^28408990 is an apocalyptic number.

28408990 is a deficient number, since it is larger than the sum of its proper divisors (25418930).

28408990 is a wasteful number, since it uses less digits than its factorization.

28408990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149547.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28408990 is about 5330.0084427700. The cubic root of 28408990 is about 305.1302498425.

The spelling of 28408990 in words is "twenty-eight million, four hundred eight thousand, nine hundred ninety".