90640851791 has 8 divisors (see below), whose sum is σ = 103608838944. Its totient is φ = 77677688160.

The previous prime is 90640851781. The next prime is 90640851811. The reversal of 90640851791 is 19715804609.

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

It is a cyclic number.

It is not a de Polignac number, because 90640851791 - 2³⁰ = 89567109967 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 (90640851751) 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, 1165520 + ... + 1240853.

It is an arithmetic number, because the mean of its divisors is an integer number (12951104868).

Almost surely, 2^90640851791 is an apocalyptic number.

90640851791 is a deficient number, since it is larger than the sum of its proper divisors (12967987153).

90640851791 is a wasteful number, since it uses less digits than its factorization.

90640851791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411761.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 90640851791 in words is "ninety billion, six hundred forty million, eight hundred fifty-one thousand, seven hundred ninety-one".