28621256 has 16 divisors (see below), whose sum is σ = 54401100. Its totient is φ = 14114304.

The previous prime is 28621253. The next prime is 28621259. The reversal of 28621256 is 65212682.

It is an interprime number because it is at equal distance from previous prime (28621253) and next prime (28621259).

It can be written as a sum of positive squares in 2 ways, for example, as 25502500 + 3118756 = 5050^2 + 1766^2 .

It is not an unprimeable number, because it can be changed into a prime (28621253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23921 + ... + 25088.

Almost surely, 2^28621256 is an apocalyptic number.

It is an amenable number.

28621256 is a deficient number, since it is larger than the sum of its proper divisors (25779844).

28621256 is a wasteful number, since it uses less digits than its factorization.

28621256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49088 (or 49084 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 28621256 is about 5349.8837370545. The cubic root of 28621256 is about 305.8883212723. Note that the first 3 decimals are identical.

The spelling of 28621256 in words is "twenty-eight million, six hundred twenty-one thousand, two hundred fifty-six".