28402847 has 4 divisors (see below), whose sum is σ = 30984936. Its totient is φ = 25820760.

The previous prime is 28402819. The next prime is 28402879. The reversal of 28402847 is 74820482.

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 28402847 - 2¹⁰ = 28401823 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 (28402807) 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, 1291028 + ... + 1291049.

It is an arithmetic number, because the mean of its divisors is an integer number (7746234).

Almost surely, 2^28402847 is an apocalyptic number.

28402847 is a deficient number, since it is larger than the sum of its proper divisors (2582089).

28402847 is a wasteful number, since it uses less digits than its factorization.

28402847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582088.

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28402847 is about 5329.4321461109. The cubic root of 28402847 is about 305.1082550415.

The spelling of 28402847 in words is "twenty-eight million, four hundred two thousand, eight hundred forty-seven".