28774749 has 4 divisors (see below), whose sum is σ = 38366336. Its totient is φ = 19183164.

The previous prime is 28774717. The next prime is 28774751. The reversal of 28774749 is 94747782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28774749 - 2⁵ = 28774717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28774698 and 28774707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28774709) 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, 4795789 + ... + 4795794.

It is an arithmetic number, because the mean of its divisors is an integer number (9591584).

Almost surely, 2^28774749 is an apocalyptic number.

It is an amenable number.

28774749 is a deficient number, since it is larger than the sum of its proper divisors (9591587).

28774749 is an equidigital number, since it uses as much as digits as its factorization.

28774749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9591586.

The product of its digits is 790272, while the sum is 48.

The square root of 28774749 is about 5364.2100070747. The cubic root of 28774749 is about 306.4341630619.

It can be divided in two parts, 2877 and 4749, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 28774749 in words is "twenty-eight million, seven hundred seventy-four thousand, seven hundred forty-nine".