28051886 has 4 divisors (see below), whose sum is σ = 42077832. Its totient is φ = 14025942.

The previous prime is 28051879. The next prime is 28051897. The reversal of 28051886 is 68815082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7012970 + ... + 7012973.

It is an arithmetic number, because the mean of its divisors is an integer number (10519458).

Almost surely, 2^28051886 is an apocalyptic number.

28051886 is a deficient number, since it is larger than the sum of its proper divisors (14025946).

28051886 is a wasteful number, since it uses less digits than its factorization.

28051886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14025945.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28051886 is about 5296.4031190988. The cubic root of 28051886 is about 303.8463486570.

The spelling of 28051886 in words is "twenty-eight million, fifty-one thousand, eight hundred eighty-six".