28722671 has 4 divisors (see below), whose sum is σ = 28888872. Its totient is φ = 28556472.

The previous prime is 28722641. The next prime is 28722677. The reversal of 28722671 is 17622782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17622782 = 2 ⋅8811391.

It is a cyclic number.

It is not a de Polignac number, because 28722671 - 2¹⁰ = 28721647 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 (28722677) 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, 82841 + ... + 83186.

It is an arithmetic number, because the mean of its divisors is an integer number (7222218).

Almost surely, 2^28722671 is an apocalyptic number.

28722671 is a deficient number, since it is larger than the sum of its proper divisors (166201).

28722671 is a wasteful number, since it uses less digits than its factorization.

28722671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166200.

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

The square root of 28722671 is about 5359.3535990826. The cubic root of 28722671 is about 306.2491847264.

The spelling of 28722671 in words is "twenty-eight million, seven hundred twenty-two thousand, six hundred seventy-one".