28297944 has 32 divisors (see below), whose sum is σ = 78606000. Its totient is φ = 9432576.

The previous prime is 28297943. The next prime is 28297957. The reversal of 28297944 is 44979282.

It is a self number, because there is not a number n which added to its sum of digits gives 28297944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297943) 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, 65289 + ... + 65720.

Almost surely, 2^28297944 is an apocalyptic number.

28297944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28297944 is an abundant number, since it is smaller than the sum of its proper divisors (50308056).

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

28297944 is a wasteful number, since it uses less digits than its factorization.

28297944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131024 (or 131014 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28297944 is about 5319.5811865221. The cubic root of 28297944 is about 304.7321629675.

It can be divided in two parts, 28297 and 944, that added together give a square (29241 = 171²).

The spelling of 28297944 in words is "twenty-eight million, two hundred ninety-seven thousand, nine hundred forty-four".