28645719 has 16 divisors (see below), whose sum is σ = 38817792. Its totient is φ = 18788288.

The previous prime is 28645717. The next prime is 28645723. The reversal of 28645719 is 91754682.

It is a cyclic number.

It is not a de Polignac number, because 28645719 - 2¹ = 28645717 is a prime.

It is a super-2 number, since 2×28645719² = 1641154434053922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74602 + ... + 74984.

It is an arithmetic number, because the mean of its divisors is an integer number (2426112).

Almost surely, 2^28645719 is an apocalyptic number.

28645719 is a deficient number, since it is larger than the sum of its proper divisors (10172073).

28645719 is a wasteful number, since it uses less digits than its factorization.

28645719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726.

The product of its digits is 120960, while the sum is 42.

The square root of 28645719 is about 5352.1695600943. The cubic root of 28645719 is about 305.9754455072.

The spelling of 28645719 in words is "twenty-eight million, six hundred forty-five thousand, seven hundred nineteen".