28578025 has 36 divisors (see below), whose sum is σ = 42301980. Its totient is φ = 19084800.

The previous prime is 28578019. The next prime is 28578031. The reversal of 28578025 is 52087582.

It is an interprime number because it is at equal distance from previous prime (28578019) and next prime (28578031).

It can be written as a sum of positive squares in 6 ways, for example, as 9314704 + 19263321 = 3052^2 + 4389^2 .

It is not a de Polignac number, because 28578025 - 2⁷ = 28577897 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49941 + ... + 50509.

It is an arithmetic number, because the mean of its divisors is an integer number (1175055).

Almost surely, 2^28578025 is an apocalyptic number.

28578025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28578025 is a deficient number, since it is larger than the sum of its proper divisors (13723955).

28578025 is a wasteful number, since it uses less digits than its factorization.

28578025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28578025 is about 5345.8418420301. The cubic root of 28578025 is about 305.7342339091.

The spelling of 28578025 in words is "twenty-eight million, five hundred seventy-eight thousand, twenty-five".