90859772871 has 200 divisors, whose sum is σ = 169623182080. Its totient is φ = 48321082656.

The previous prime is 90859772867. The next prime is 90859772873. The reversal of 90859772871 is 17827795809.

It is not a de Polignac number, because 90859772871 - 2² = 90859772867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90859772799 and 90859772808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90859772873) by changing a digit.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 247574130 + ... + 247574496.

Almost surely, 2^90859772871 is an apocalyptic number.

90859772871 is a deficient number, since it is larger than the sum of its proper divisors (78763409209).

90859772871 is an equidigital number, since it uses as much as digits as its factorization.

90859772871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 63.

The spelling of 90859772871 in words is "ninety billion, eight hundred fifty-nine million, seven hundred seventy-two thousand, eight hundred seventy-one".