28744820 has 24 divisors (see below), whose sum is σ = 65008104. Its totient is φ = 10613376.

The previous prime is 28744817. The next prime is 28744823. The reversal of 28744820 is 2844782.

It is an interprime number because it is at equal distance from previous prime (28744817) and next prime (28744823).

It can be written as a sum of positive squares in 4 ways, for example, as 633616 + 28111204 = 796^2 + 5302^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744823) 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, 55019 + ... + 55538.

It is an arithmetic number, because the mean of its divisors is an integer number (2708671).

Almost surely, 2^28744820 is an apocalyptic number.

28744820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28744820 is an abundant number, since it is smaller than the sum of its proper divisors (36263284).

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

28744820 is a wasteful number, since it uses less digits than its factorization.

28744820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110579 (or 110577 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28744820 is about 5361.4195881315. The cubic root of 28744820 is about 306.3278841201.

The spelling of 28744820 in words is "twenty-eight million, seven hundred forty-four thousand, eight hundred twenty".