28055577 has 16 divisors (see below), whose sum is σ = 41303808. Its totient is φ = 16796880.

The previous prime is 28055551. The next prime is 28055581. The reversal of 28055577 is 77555082.

It is not a de Polignac number, because 28055577 - 2¹⁹ = 27531289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28055777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2383 + ... + 7860.

It is an arithmetic number, because the mean of its divisors is an integer number (2581488).

Almost surely, 2^28055577 is an apocalyptic number.

It is an amenable number.

28055577 is a deficient number, since it is larger than the sum of its proper divisors (13248231).

28055577 is a wasteful number, since it uses less digits than its factorization.

28055577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 28055577 is about 5296.7515516588. The cubic root of 28055577 is about 303.8596745309.

The spelling of 28055577 in words is "twenty-eight million, fifty-five thousand, five hundred seventy-seven".