28613777 has 4 divisors (see below), whose sum is σ = 29311716. Its totient is φ = 27915840.

The previous prime is 28613773. The next prime is 28613789. The reversal of 28613777 is 77731682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 17297281 = 3364^2 + 4159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28613777 - 2² = 28613773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 697897 = 28613777 / (2 + 8 + 6 + 1 + 3 + 7 + 7 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28613773) 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, 348908 + ... + 348989.

It is an arithmetic number, because the mean of its divisors is an integer number (7327929).

Almost surely, 2^28613777 is an apocalyptic number.

It is an amenable number.

28613777 is a deficient number, since it is larger than the sum of its proper divisors (697939).

28613777 is an equidigital number, since it uses as much as digits as its factorization.

28613777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697938.

The product of its digits is 98784, while the sum is 41.

The square root of 28613777 is about 5349.1847042330. The cubic root of 28613777 is about 305.8616751315.

The spelling of 28613777 in words is "twenty-eight million, six hundred thirteen thousand, seven hundred seventy-seven".