28881766 has 4 divisors (see below), whose sum is σ = 43322652. Its totient is φ = 14440882.

The previous prime is 28881737. The next prime is 28881773. The reversal of 28881766 is 66718882.

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, 7220440 + ... + 7220443.

It is an arithmetic number, because the mean of its divisors is an integer number (10830663).

Almost surely, 2^28881766 is an apocalyptic number.

28881766 is a deficient number, since it is larger than the sum of its proper divisors (14440886).

28881766 is a wasteful number, since it uses less digits than its factorization.

28881766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14440885.

The product of its digits is 258048, while the sum is 46.

The square root of 28881766 is about 5374.1758437922. The cubic root of 28881766 is about 306.8135824619.

The spelling of 28881766 in words is "twenty-eight million, eight hundred eighty-one thousand, seven hundred sixty-six".