28077775 has 12 divisors (see below), whose sum is σ = 37981944. Its totient is φ = 20420000.

The previous prime is 28077773. The next prime is 28077781. The reversal of 28077775 is 57777082.

It is not a de Polignac number, because 28077775 - 2¹ = 28077773 is a prime.

It is a super-2 number, since 2×28077775² = 1576722897901250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50776 + ... + 51325.

It is an arithmetic number, because the mean of its divisors is an integer number (3165162).

Almost surely, 2^28077775 is an apocalyptic number.

28077775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28077775 is a deficient number, since it is larger than the sum of its proper divisors (9904169).

28077775 is a wasteful number, since it uses less digits than its factorization.

28077775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102122 (or 102117 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 43.

The square root of 28077775 is about 5298.8465726043. The cubic root of 28077775 is about 303.9397928725.

The spelling of 28077775 in words is "twenty-eight million, seventy-seven thousand, seven hundred seventy-five".