28831977 has 8 divisors (see below), whose sum is σ = 42714080. Its totient is φ = 19221300.

The previous prime is 28831969. The next prime is 28831997. The reversal of 28831977 is 77913882.

It is not a de Polignac number, because 28831977 - 2³ = 28831969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28831927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533899 + ... + 533952.

It is an arithmetic number, because the mean of its divisors is an integer number (5339260).

Almost surely, 2^28831977 is an apocalyptic number.

28831977 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28831977 is a deficient number, since it is larger than the sum of its proper divisors (13882103).

28831977 is a wasteful number, since it uses less digits than its factorization.

28831977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067860 (or 1067854 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28831977 is about 5369.5416005465. The cubic root of 28831977 is about 306.6371767221.

It can be divided in two parts, 2883197 and 7, that added together give a square (2883204 = 1698²).

The spelling of 28831977 in words is "twenty-eight million, eight hundred thirty-one thousand, nine hundred seventy-seven".