28757069 has 4 divisors (see below), whose sum is σ = 31371360. Its totient is φ = 26142780.

The previous prime is 28757063. The next prime is 28757077. The reversal of 28757069 is 96075782.

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 a cyclic number.

It is not a de Polignac number, because 28757069 - 2²⁴ = 11979853 is a prime.

It is a super-2 number, since 2×28757069² = 1653938034941522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757063) 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, 1307129 + ... + 1307150.

It is an arithmetic number, because the mean of its divisors is an integer number (7842840).

Almost surely, 2^28757069 is an apocalyptic number.

It is an amenable number.

28757069 is a deficient number, since it is larger than the sum of its proper divisors (2614291).

28757069 is a wasteful number, since it uses less digits than its factorization.

28757069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614290.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 28757069 is about 5362.5617945158. The cubic root of 28757069 is about 306.3713896677.

The spelling of 28757069 in words is "twenty-eight million, seven hundred fifty-seven thousand, sixty-nine".