28739944 has 8 divisors (see below), whose sum is σ = 53887410. Its totient is φ = 14369968.

The previous prime is 28739941. The next prime is 28739999. The reversal of 28739944 is 44993782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26399044 + 2340900 = 5138^2 + 1530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28739944² = 1651968762246272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28739894 and 28739903.

It is not an unprimeable number, because it can be changed into a prime (28739941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1796239 + ... + 1796254.

Almost surely, 2^28739944 is an apocalyptic number.

It is an amenable number.

28739944 is a deficient number, since it is larger than the sum of its proper divisors (25147466).

28739944 is a wasteful number, since it uses less digits than its factorization.

28739944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592499 (or 3592495 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 28739944 is about 5360.9648385342. The cubic root of 28739944 is about 306.3105622835.

The spelling of 28739944 in words is "twenty-eight million, seven hundred thirty-nine thousand, nine hundred forty-four".