28647701 has 4 divisors (see below), whose sum is σ = 28660512. Its totient is φ = 28634892.

The previous prime is 28647677. The next prime is 28647709. The reversal of 28647701 is 10774682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28647701 - 2⁶ = 28647637 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 (28647709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2075 + ... + 7848.

It is an arithmetic number, because the mean of its divisors is an integer number (7165128).

Almost surely, 2^28647701 is an apocalyptic number.

It is an amenable number.

28647701 is a deficient number, since it is larger than the sum of its proper divisors (12811).

28647701 is an equidigital number, since it uses as much as digits as its factorization.

28647701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12810.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28647701 is about 5352.3547154500. The cubic root of 28647701 is about 305.9825021677.

The spelling of 28647701 in words is "twenty-eight million, six hundred forty-seven thousand, seven hundred one".