90307071891 has 12 divisors (see below), whose sum is σ = 131439302280. Its totient is φ = 59745135840.

The previous prime is 90307071871. The next prime is 90307071931. The reversal of 90307071891 is 19817070309.

It is not a de Polignac number, because 90307071891 - 2¹³ = 90307063699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90307071871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38296986 + ... + 38299343.

It is an arithmetic number, because the mean of its divisors is an integer number (10953275190).

Almost surely, 2^90307071891 is an apocalyptic number.

90307071891 is a deficient number, since it is larger than the sum of its proper divisors (41132230389).

90307071891 is a wasteful number, since it uses less digits than its factorization.

90307071891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76596466 (or 76596463 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

It can be divided in two parts, 9030 and 7071891, that added together give a square (7080921 = 2661²).

The spelling of 90307071891 in words is "ninety billion, three hundred seven million, seventy-one thousand, eight hundred ninety-one".