28016761 has 4 divisors (see below), whose sum is σ = 28041552. Its totient is φ = 27991972.

The previous prime is 28016759. The next prime is 28016771. The reversal of 28016761 is 16761082.

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.

It is a cyclic number.

It is not a de Polignac number, because 28016761 - 2¹ = 28016759 is a prime.

It is a super-2 number, since 2×28016761² = 1569877793862242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28016711) 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, 10615 + ... + 12988.

It is an arithmetic number, because the mean of its divisors is an integer number (7010388).

Almost surely, 2^28016761 is an apocalyptic number.

It is an amenable number.

28016761 is a deficient number, since it is larger than the sum of its proper divisors (24791).

28016761 is a wasteful number, since it uses less digits than its factorization.

28016761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24790.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28016761 is about 5293.0861508198. The cubic root of 28016761 is about 303.7194758965.

The spelling of 28016761 in words is "twenty-eight million, sixteen thousand, seven hundred sixty-one".