28761691 has 8 divisors (see below), whose sum is σ = 33759200. Its totient is φ = 23986368.

The previous prime is 28761673. The next prime is 28761701. The reversal of 28761691 is 19616782.

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

It is not a de Polignac number, because 28761691 - 2⁵ = 28761659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28761631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55266 + ... + 55783.

It is an arithmetic number, because the mean of its divisors is an integer number (4219900).

Almost surely, 2^28761691 is an apocalyptic number.

28761691 is a deficient number, since it is larger than the sum of its proper divisors (4997509).

28761691 is a wasteful number, since it uses less digits than its factorization.

28761691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111093.

The product of its digits is 36288, while the sum is 40.

The square root of 28761691 is about 5362.9927279458. The cubic root of 28761691 is about 306.3878027069.

The spelling of 28761691 in words is "twenty-eight million, seven hundred sixty-one thousand, six hundred ninety-one".