28756047 has 16 divisors (see below), whose sum is σ = 39443040. Its totient is φ = 18624000.

The previous prime is 28756043. The next prime is 28756093. The reversal of 28756047 is 74065782.

It is not a de Polignac number, because 28756047 - 2² = 28756043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28755996 and 28756014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756043) 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, 47547 + ... + 48147.

It is an arithmetic number, because the mean of its divisors is an integer number (2465190).

Almost surely, 2^28756047 is an apocalyptic number.

28756047 is a deficient number, since it is larger than the sum of its proper divisors (10686993).

28756047 is a wasteful number, since it uses less digits than its factorization.

28756047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 28756047 is about 5362.4665033919. The cubic root of 28756047 is about 306.3677602381.

The spelling of 28756047 in words is "twenty-eight million, seven hundred fifty-six thousand, forty-seven".