28522857 has 16 divisors (see below), whose sum is σ = 43672320. Its totient is φ = 16376400.

The previous prime is 28522853. The next prime is 28522861. The reversal of 28522857 is 75822582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28522853) and next prime (28522861).

It is not a de Polignac number, because 28522857 - 2² = 28522853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28522853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22119 + ... + 23372.

It is an arithmetic number, because the mean of its divisors is an integer number (2729520).

Almost surely, 2^28522857 is an apocalyptic number.

It is an amenable number.

28522857 is a deficient number, since it is larger than the sum of its proper divisors (15149463).

28522857 is a wasteful number, since it uses less digits than its factorization.

28522857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45524.

The product of its digits is 89600, while the sum is 39.

The square root of 28522857 is about 5340.6794511560. The cubic root of 28522857 is about 305.5373738946.

It can be divided in two parts, 285 and 22857, that multiplied together give a triangular number (6514245 = T₃₆₀₉).

The spelling of 28522857 in words is "twenty-eight million, five hundred twenty-two thousand, eight hundred fifty-seven".