28444620 has 24 divisors (see below), whose sum is σ = 79645104. Its totient is φ = 7585216.

The previous prime is 28444597. The next prime is 28444657. The reversal of 28444620 is 2644482.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236979 + ... + 237098.

It is an arithmetic number, because the mean of its divisors is an integer number (3318546).

Almost surely, 2^28444620 is an apocalyptic number.

28444620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28444620 is an abundant number, since it is smaller than the sum of its proper divisors (51200484).

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

28444620 is a wasteful number, since it uses less digits than its factorization.

28444620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474089 (or 474087 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 28444620 is about 5333.3497916413. The cubic root of 28444620 is about 305.2577593492.

The spelling of 28444620 in words is "twenty-eight million, four hundred forty-four thousand, six hundred twenty".