28899425 has 6 divisors (see below), whose sum is σ = 35835318. Its totient is φ = 23119520.

The previous prime is 28899419. The next prime is 28899463. The reversal of 28899425 is 52499882.

It can be written as a sum of positive squares in 3 ways, for example, as 1263376 + 27636049 = 1124^2 + 5257^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28899425 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28899425.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 577964 + ... + 578013.

It is an arithmetic number, because the mean of its divisors is an integer number (5972553).

Almost surely, 2^28899425 is an apocalyptic number.

28899425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28899425 is a deficient number, since it is larger than the sum of its proper divisors (6935893).

28899425 is a wasteful number, since it uses less digits than its factorization.

28899425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155987 (or 1155982 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 28899425 is about 5375.8185423245. The cubic root of 28899425 is about 306.8761007672.

The spelling of 28899425 in words is "twenty-eight million, eight hundred ninety-nine thousand, four hundred twenty-five".