28751444 has 6 divisors (see below), whose sum is σ = 50315034. Its totient is φ = 14375720.

The previous prime is 28751431. The next prime is 28751447. The reversal of 28751444 is 44415782.

It can be written as a sum of positive squares in only one way, i.e., 28751044 + 400 = 5362^2 + 20^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28751447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3593927 + ... + 3593934.

It is an arithmetic number, because the mean of its divisors is an integer number (8385839).

Almost surely, 2^28751444 is an apocalyptic number.

It is an amenable number.

28751444 is a deficient number, since it is larger than the sum of its proper divisors (21563590).

28751444 is a wasteful number, since it uses less digits than its factorization.

28751444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187865 (or 7187863 counting only the distinct ones).

The product of its digits is 35840, while the sum is 35.

The square root of 28751444 is about 5362.0372993854. The cubic root of 28751444 is about 306.3514125339.

The spelling of 28751444 in words is "twenty-eight million, seven hundred fifty-one thousand, four hundred forty-four".