28057777 has 8 divisors (see below), whose sum is σ = 30647232. Its totient is φ = 25474800.

The previous prime is 28057753. The next prime is 28057781. The reversal of 28057777 is 77775082.

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 28057777 - 2¹⁵ = 28025009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28057717) 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, 14268 + ... + 16114.

It is an arithmetic number, because the mean of its divisors is an integer number (3830904).

Almost surely, 2^28057777 is an apocalyptic number.

It is an amenable number.

28057777 is a deficient number, since it is larger than the sum of its proper divisors (2589455).

28057777 is a wasteful number, since it uses less digits than its factorization.

28057777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

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

The square root of 28057777 is about 5296.9592220443. The cubic root of 28057777 is about 303.8676167880.

The spelling of 28057777 in words is "twenty-eight million, fifty-seven thousand, seven hundred seventy-seven".