28786810357861 has 8 divisors (see below), whose sum is σ = 29400169607424. Its totient is φ = 28173487521840.

The previous prime is 28786810357853. The next prime is 28786810357897. The reversal of 28786810357861 is 16875301868782.

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

It is not a de Polignac number, because 28786810357861 - 2³ = 28786810357853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786810355861) 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, 7502470 + ... + 10670551.

It is an arithmetic number, because the mean of its divisors is an integer number (3675021200928).

Almost surely, 2^{28786810357861} is an apocalyptic number.

It is an amenable number.

28786810357861 is a deficient number, since it is larger than the sum of its proper divisors (613359249563).

28786810357861 is a wasteful number, since it uses less digits than its factorization.

28786810357861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18206771.

The product of its (nonzero) digits is 216760320, while the sum is 70.

The spelling of 28786810357861 in words is "twenty-eight trillion, seven hundred eighty-six billion, eight hundred ten million, three hundred fifty-seven thousand, eight hundred sixty-one".