28292500 has 30 divisors (see below), whose sum is σ = 61875506. Its totient is φ = 11316000.

The previous prime is 28292483. The next prime is 28292519. The reversal of 28292500 is 529282.

It can be written as a sum of positive squares in 5 ways, for example, as 3671056 + 24621444 = 1916^2 + 4962^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3159 + ... + 8158.

Almost surely, 2^28292500 is an apocalyptic number.

28292500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28292500 is an abundant number, since it is smaller than the sum of its proper divisors (33583006).

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

28292500 is a wasteful number, since it uses less digits than its factorization.

28292500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11341 (or 11324 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 28292500 is about 5319.0694674915. The cubic root of 28292500 is about 304.7126201073.

It can be divided in two parts, 2829 and 2500, that added together give a square (5329 = 73²).

The spelling of 28292500 in words is "twenty-eight million, two hundred ninety-two thousand, five hundred".