28578365 has 4 divisors (see below), whose sum is σ = 34294044. Its totient is φ = 22862688.

The previous prime is 28578313. The next prime is 28578371. The reversal of 28578365 is 56387582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12880921 + 15697444 = 3589^2 + 3962^2 .

It is a cyclic number.

It is not a de Polignac number, because 28578365 - 2¹² = 28574269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857832 + ... + 2857841.

It is an arithmetic number, because the mean of its divisors is an integer number (8573511).

Almost surely, 2^28578365 is an apocalyptic number.

It is an amenable number.

28578365 is a deficient number, since it is larger than the sum of its proper divisors (5715679).

28578365 is an equidigital number, since it uses as much as digits as its factorization.

28578365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715678.

The product of its digits is 403200, while the sum is 44.

The square root of 28578365 is about 5345.8736423526. The cubic root of 28578365 is about 305.7354463702.

The spelling of 28578365 in words is "twenty-eight million, five hundred seventy-eight thousand, three hundred sixty-five".