28400895 has 32 divisors (see below), whose sum is σ = 51148800. Its totient is φ = 14949792.

The previous prime is 28400893. The next prime is 28400917. The reversal of 28400895 is 59800482.

It is not a de Polignac number, because 28400895 - 2¹ = 28400893 is a prime.

It is a super-2 number, since 2×28400895² = 1613221673602050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28400893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9334 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (1598400).

Almost surely, 2^28400895 is an apocalyptic number.

28400895 is a deficient number, since it is larger than the sum of its proper divisors (22747905).

28400895 is a wasteful number, since it uses less digits than its factorization.

28400895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756 (or 2750 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28400895 is about 5329.2490090068. The cubic root of 28400895 is about 305.1012653084.

The spelling of 28400895 in words is "twenty-eight million, four hundred thousand, eight hundred ninety-five".