28726647 has 8 divisors (see below), whose sum is σ = 38697456. Its totient is φ = 18953472.

The previous prime is 28726601. The next prime is 28726657. The reversal of 28726647 is 74662782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28726647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28726599 and 28726608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28726657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49068 + ... + 49649.

It is an arithmetic number, because the mean of its divisors is an integer number (4837182).

Almost surely, 2^28726647 is an apocalyptic number.

28726647 is a deficient number, since it is larger than the sum of its proper divisors (9970809).

28726647 is an equidigital number, since it uses as much as digits as its factorization.

28726647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98817.

The product of its digits is 225792, while the sum is 42.

The square root of 28726647 is about 5359.7245265032. The cubic root of 28726647 is about 306.2633151506.

The spelling of 28726647 in words is "twenty-eight million, seven hundred twenty-six thousand, six hundred forty-seven".