28019744 has 12 divisors (see below), whose sum is σ = 55163934. Its totient is φ = 14009856.

The previous prime is 28019743. The next prime is 28019777. The reversal of 28019744 is 44791082.

It can be written as a sum of positive squares in only one way, i.e., 23232400 + 4787344 = 4820^2 + 2188^2 .

It is not an unprimeable number, because it can be changed into a prime (28019743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 437777 + ... + 437840.

Almost surely, 2^28019744 is an apocalyptic number.

It is an amenable number.

28019744 is a deficient number, since it is larger than the sum of its proper divisors (27144190).

28019744 is an equidigital number, since it uses as much as digits as its factorization.

28019744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875627 (or 875619 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28019744 is about 5293.3679259995. The cubic root of 28019744 is about 303.7302547186.

The spelling of 28019744 in words is "twenty-eight million, nineteen thousand, seven hundred forty-four".