28757769 has 32 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 17740800.

The previous prime is 28757741. The next prime is 28757777. The reversal of 28757769 is 96775782.

It is not a de Polignac number, because 28757769 - 2²⁰ = 27709193 is a prime.

It is a super-2 number, since 2×28757769² = 1654018555714722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28757719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323077 + ... + 323165.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^28757769 is an apocalyptic number.

It is an amenable number.

28757769 is a deficient number, since it is larger than the sum of its proper divisors (12610551).

28757769 is a wasteful number, since it uses less digits than its factorization.

28757769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241.

The product of its digits is 1481760, while the sum is 51.

The square root of 28757769 is about 5362.6270614317. The cubic root of 28757769 is about 306.3738755287.

The spelling of 28757769 in words is "twenty-eight million, seven hundred fifty-seven thousand, seven hundred sixty-nine".