28801944 has 48 divisors (see below), whose sum is σ = 82597320. Its totient is φ = 9035520.

The previous prime is 28801909. The next prime is 28801951. The reversal of 28801944 is 44910882.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28801899 and 28801908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10542 + ... + 12989.

Almost surely, 2^28801944 is an apocalyptic number.

28801944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28801944 is an abundant number, since it is smaller than the sum of its proper divisors (53795376).

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

28801944 is a wasteful number, since it uses less digits than its factorization.

28801944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23560 (or 23553 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28801944 is about 5366.7442644494. The cubic root of 28801944 is about 306.5306695871.

The spelling of 28801944 in words is "twenty-eight million, eight hundred one thousand, nine hundred forty-four".