28799525 has 6 divisors (see below), whose sum is σ = 35711442. Its totient is φ = 23039600.

The previous prime is 28799509. The next prime is 28799539. The reversal of 28799525 is 52599782.

It can be written as a sum of positive squares in 3 ways, for example, as 7279204 + 21520321 = 2698^2 + 4639^2 .

It is not a de Polignac number, because 28799525 - 2⁴ = 28799509 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 28799525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575966 + ... + 576015.

It is an arithmetic number, because the mean of its divisors is an integer number (5951907).

Almost surely, 2^28799525 is an apocalyptic number.

28799525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28799525 is a deficient number, since it is larger than the sum of its proper divisors (6911917).

28799525 is a wasteful number, since it uses less digits than its factorization.

28799525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151991 (or 1151986 counting only the distinct ones).

The product of its digits is 453600, while the sum is 47.

The square root of 28799525 is about 5366.5188903050. The cubic root of 28799525 is about 306.5220877770.

The spelling of 28799525 in words is "twenty-eight million, seven hundred ninety-nine thousand, five hundred twenty-five".