90893971671890 has 24 divisors (see below), whose sum is σ = 168150527896932. Its totient is φ = 35374951131840.

The previous prime is 90893971671857. The next prime is 90893971671911. The reversal of 90893971671890 is 9817617939809.

It is a Cunningham number, because it is equal to 9533833²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 56673448943329 + 34220522728561 = 7528177^2 + 5849831^2 .

It is a Smith number, since the sum of its digits (77) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3319707701 + ... + 3319735080.

Almost surely, 2^{90893971671890} is an apocalyptic number.

90893971671890 is a deficient number, since it is larger than the sum of its proper divisors (77256556225042).

90893971671890 is a wasteful number, since it uses less digits than its factorization.

90893971671890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639442862 (or 6639442825 counting only the distinct ones).

The product of its (nonzero) digits is 370355328, while the sum is 77.

The spelling of 90893971671890 in words is "ninety trillion, eight hundred ninety-three billion, nine hundred seventy-one million, six hundred seventy-one thousand, eight hundred ninety".