28783187817 has 8 divisors (see below), whose sum is σ = 38378860320. Its totient is φ = 19188153600.

The previous prime is 28783187809. The next prime is 28783187831. The reversal of 28783187817 is 71878138782.

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

It is not a de Polignac number, because 28783187817 - 2³ = 28783187809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28783187717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41967 + ... + 243572.

It is an arithmetic number, because the mean of its divisors is an integer number (4797357540).

Almost surely, 2^28783187817 is an apocalyptic number.

It is an amenable number.

28783187817 is a deficient number, since it is larger than the sum of its proper divisors (9595672503).

28783187817 is a wasteful number, since it uses less digits than its factorization.

28783187817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319143.

The product of its digits is 8429568, while the sum is 60.

The spelling of 28783187817 in words is "twenty-eight billion, seven hundred eighty-three million, one hundred eighty-seven thousand, eight hundred seventeen".