28777331 has 8 divisors (see below), whose sum is σ = 32406528. Its totient is φ = 25317000.

The previous prime is 28777327. The next prime is 28777337. The reversal of 28777331 is 13377782.

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 28777331 - 2² = 28777327 is a prime.

It is a super-2 number, since 2×28777331² = 1656269558967122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28777337) 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, 41855 + ... + 42536.

It is an arithmetic number, because the mean of its divisors is an integer number (4050816).

Almost surely, 2^28777331 is an apocalyptic number.

28777331 is a deficient number, since it is larger than the sum of its proper divisors (3629197).

28777331 is a wasteful number, since it uses less digits than its factorization.

28777331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84433.

The product of its digits is 49392, while the sum is 38.

The square root of 28777331 is about 5364.4506708516. The cubic root of 28777331 is about 306.4433283819.

The spelling of 28777331 in words is "twenty-eight million, seven hundred seventy-seven thousand, three hundred thirty-one".