28705677 has 64 divisors (see below), whose sum is σ = 52469760. Its totient is φ = 13590720.

The previous prime is 28705669. The next prime is 28705687. The reversal of 28705677 is 77650782.

It is not a de Polignac number, because 28705677 - 2³ = 28705669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28705627) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 363324 + ... + 363402.

It is an arithmetic number, because the mean of its divisors is an integer number (819840).

Almost surely, 2^28705677 is an apocalyptic number.

It is an amenable number.

28705677 is a deficient number, since it is larger than the sum of its proper divisors (23764083).

28705677 is a wasteful number, since it uses less digits than its factorization.

28705677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 28705677 is about 5357.7679121067. The cubic root of 28705677 is about 306.1887745439.

The spelling of 28705677 in words is "twenty-eight million, seven hundred five thousand, six hundred seventy-seven".