28226920 has 32 divisors (see below), whose sum is σ = 64991520. Its totient is φ = 11027520.

The previous prime is 28226917. The next prime is 28226923. The reversal of 28226920 is 2962282.

It is an interprime number because it is at equal distance from previous prime (28226917) and next prime (28226923).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28226923) 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, 6486 + ... + 9925.

It is an arithmetic number, because the mean of its divisors is an integer number (2030985).

Almost surely, 2^28226920 is an apocalyptic number.

28226920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28226920 is an abundant number, since it is smaller than the sum of its proper divisors (36764600).

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

28226920 is a wasteful number, since it uses less digits than its factorization.

28226920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16465 (or 16461 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28226920 is about 5312.9012789624. The cubic root of 28226920 is about 304.4770039157.

The spelling of 28226920 in words is "twenty-eight million, two hundred twenty-six thousand, nine hundred twenty".