28123777 has 8 divisors (see below), whose sum is σ = 30746880. Its totient is φ = 25511760.

The previous prime is 28123759. The next prime is 28123787. The reversal of 28123777 is 77732182.

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 28123777 - 2²³ = 19735169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28123747) 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, 3088 + ... + 8110.

It is an arithmetic number, because the mean of its divisors is an integer number (3843360).

Almost surely, 2^28123777 is an apocalyptic number.

It is an amenable number.

28123777 is a deficient number, since it is larger than the sum of its proper divisors (2623103).

28123777 is a wasteful number, since it uses less digits than its factorization.

28123777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543.

The product of its digits is 32928, while the sum is 37.

The square root of 28123777 is about 5303.1855520998. The cubic root of 28123777 is about 304.1056916952.

It can be divided in two parts, 28123 and 777, that added together give a square (28900 = 170²).

The spelling of 28123777 in words is "twenty-eight million, one hundred twenty-three thousand, seven hundred seventy-seven".