28776983 has 4 divisors (see below), whose sum is σ = 28789488. Its totient is φ = 28764480.

The previous prime is 28776977. The next prime is 28776997. The reversal of 28776983 is 38967782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28776983 - 2⁴ = 28776967 is a prime.

It is a super-2 number, since 2×28776983² = 1656229501164578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28776973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691 + ... + 7772.

It is an arithmetic number, because the mean of its divisors is an integer number (7197372).

Almost surely, 2^28776983 is an apocalyptic number.

28776983 is a deficient number, since it is larger than the sum of its proper divisors (12505).

28776983 is an equidigital number, since it uses as much as digits as its factorization.

28776983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12504.

The product of its digits is 1016064, while the sum is 50.

The square root of 28776983 is about 5364.4182350000. The cubic root of 28776983 is about 306.4420931190.

The spelling of 28776983 in words is "twenty-eight million, seven hundred seventy-six thousand, nine hundred eighty-three".