28710919 has 4 divisors (see below), whose sum is σ = 30222040. Its totient is φ = 27199800.

The previous prime is 28710917. The next prime is 28710949. The reversal of 28710919 is 91901782.

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 28710919 - 2¹ = 28710917 is a prime.

It is a super-2 number, since 2×28710919² = 1648633739649122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28710917) 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, 755532 + ... + 755569.

It is an arithmetic number, because the mean of its divisors is an integer number (7555510).

Almost surely, 2^28710919 is an apocalyptic number.

28710919 is a deficient number, since it is larger than the sum of its proper divisors (1511121).

28710919 is a wasteful number, since it uses less digits than its factorization.

28710919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511120.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 28710919 is about 5358.2570860309. The cubic root of 28710919 is about 306.2074113205.

The spelling of 28710919 in words is "twenty-eight million, seven hundred ten thousand, nine hundred nineteen".