28125047 has 4 divisors (see below), whose sum is σ = 28280616. Its totient is φ = 27969480.

The previous prime is 28125043. The next prime is 28125061. The reversal of 28125047 is 74052182.

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 28125047 - 2² = 28125043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28125043) 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, 77513 + ... + 77874.

It is an arithmetic number, because the mean of its divisors is an integer number (7070154).

Almost surely, 2^28125047 is an apocalyptic number.

28125047 is a deficient number, since it is larger than the sum of its proper divisors (155569).

28125047 is a wasteful number, since it uses less digits than its factorization.

28125047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155568.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 28125047 is about 5303.3052900998. The cubic root of 28125047 is about 304.1102691792.

The spelling of 28125047 in words is "twenty-eight million, one hundred twenty-five thousand, forty-seven".