28051855 has 8 divisors (see below), whose sum is σ = 36251712. Its totient is φ = 20715168.

The previous prime is 28051823. The next prime is 28051861. The reversal of 28051855 is 55815082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28051855 - 2⁵ = 28051823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28051855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215719 + ... + 215848.

It is an arithmetic number, because the mean of its divisors is an integer number (4531464).

Almost surely, 2^28051855 is an apocalyptic number.

28051855 is a deficient number, since it is larger than the sum of its proper divisors (8199857).

28051855 is a wasteful number, since it uses less digits than its factorization.

28051855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431585.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 28051855 is about 5296.4001925836. The cubic root of 28051855 is about 303.8462367306.

The spelling of 28051855 in words is "twenty-eight million, fifty-one thousand, eight hundred fifty-five".