28622251 has 4 divisors (see below), whose sum is σ = 32711152. Its totient is φ = 24533352.

The previous prime is 28622249. The next prime is 28622261. The reversal of 28622251 is 15222682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28622251 - 2¹ = 28622249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28622261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044440 + ... + 2044453.

It is an arithmetic number, because the mean of its divisors is an integer number (8177788).

Almost surely, 2^28622251 is an apocalyptic number.

28622251 is a deficient number, since it is larger than the sum of its proper divisors (4088901).

28622251 is an equidigital number, since it uses as much as digits as its factorization.

28622251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088900.

The product of its digits is 3840, while the sum is 28.

The square root of 28622251 is about 5349.9767289214. The cubic root of 28622251 is about 305.8918659031.

The spelling of 28622251 in words is "twenty-eight million, six hundred twenty-two thousand, two hundred fifty-one".