28622844 has 18 divisors (see below), whose sum is σ = 72352280. Its totient is φ = 9540936.

The previous prime is 28622843. The next prime is 28622851. The reversal of 28622844 is 44822682.

It is a happy number.

28622844 is a `hidden beast` number, since 28 + 622 + 8 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 795079 = 28622844 / (2 + 8 + 6 + 2 + 2 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 28622799 and 28622808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28622843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 397504 + ... + 397575.

Almost surely, 2^28622844 is an apocalyptic number.

It is an amenable number.

28622844 is an abundant number, since it is smaller than the sum of its proper divisors (43729436).

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

28622844 is a wasteful number, since it uses less digits than its factorization.

28622844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795089 (or 795084 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

The square root of 28622844 is about 5350.0321494361. The cubic root of 28622844 is about 305.8939783927.

The spelling of 28622844 in words is "twenty-eight million, six hundred twenty-two thousand, eight hundred forty-four".