28226990 has 16 divisors (see below), whose sum is σ = 55427760. Its totient is φ = 10264320.

The previous prime is 28226971. The next prime is 28226999. The reversal of 28226990 is 9962282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28226999) 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, 128195 + ... + 128414.

It is an arithmetic number, because the mean of its divisors is an integer number (3464235).

Almost surely, 2^28226990 is an apocalyptic number.

28226990 is a deficient number, since it is larger than the sum of its proper divisors (27200770).

28226990 is a wasteful number, since it uses less digits than its factorization.

28226990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256627.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28226990 is about 5312.9078666960. The cubic root of 28226990 is about 304.4772556065.

It can be divided in two parts, 282 and 26990, that added together give a palindrome (27272).

The spelling of 28226990 in words is "twenty-eight million, two hundred twenty-six thousand, nine hundred ninety".