28897855 has 16 divisors (see below), whose sum is σ = 40080960. Its totient is φ = 19590912.

The previous prime is 28897801. The next prime is 28897873. The reversal of 28897855 is 55879882.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28897855 - 2⁹ = 28897343 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1524 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (2505060).

Almost surely, 2^28897855 is an apocalyptic number.

28897855 is a deficient number, since it is larger than the sum of its proper divisors (11183105).

28897855 is an equidigital number, since it uses as much as digits as its factorization.

28897855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9378.

The product of its digits is 1612800, while the sum is 52.

The square root of 28897855 is about 5375.6725160672. The cubic root of 28897855 is about 306.8705435147.

It can be divided in two parts, 28897 and 855, that multiplied together give a triangular number (24706935 = T₇₀₂₉).

The spelling of 28897855 in words is "twenty-eight million, eight hundred ninety-seven thousand, eight hundred fifty-five".