28578275 has 24 divisors (see below), whose sum is σ = 40939344. Its totient is φ = 19558400.

The previous prime is 28578269. The next prime is 28578283. The reversal of 28578275 is 57287582.

28578275 = 478² + 479² + ... + 579².

It is not a de Polignac number, because 28578275 - 2⁶ = 28578211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1619 + ... + 7731.

It is an arithmetic number, because the mean of its divisors is an integer number (1705806).

Almost surely, 2^28578275 is an apocalyptic number.

28578275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28578275 is a deficient number, since it is larger than the sum of its proper divisors (12361069).

28578275 is a wasteful number, since it uses less digits than its factorization.

28578275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6151 (or 6146 counting only the distinct ones).

The product of its digits is 313600, while the sum is 44.

The square root of 28578275 is about 5345.8652246386. The cubic root of 28578275 is about 305.7351254256.

The spelling of 28578275 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred seventy-five".