28655047 has 4 divisors (see below), whose sum is σ = 30340656. Its totient is φ = 26969440.

The previous prime is 28655041. The next prime is 28655051. The reversal of 28655047 is 74055682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28655047 - 2⁷ = 28654919 is a prime.

It is a super-2 number, since 2×28655047² = 1642223437144418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28654997 and 28655015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655041) 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, 842779 + ... + 842812.

It is an arithmetic number, because the mean of its divisors is an integer number (7585164).

Almost surely, 2^28655047 is an apocalyptic number.

28655047 is a deficient number, since it is larger than the sum of its proper divisors (1685609).

28655047 is a wasteful number, since it uses less digits than its factorization.

28655047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685608.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 28655047 is about 5353.0409114820. The cubic root of 28655047 is about 306.0086538342.

The spelling of 28655047 in words is "twenty-eight million, six hundred fifty-five thousand, forty-seven".