80891003640 has 128 divisors (see below), whose sum is σ = 246973536000. Its totient is φ = 21189224448.

The previous prime is 80891003639. The next prime is 80891003651. The reversal of 80891003640 is 4630019808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11458992 + ... + 11466048.

It is an arithmetic number, because the mean of its divisors is an integer number (1929480750).

Almost surely, 2^80891003640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80891003640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123486768000).

80891003640 is an abundant number, since it is smaller than the sum of its proper divisors (166082532360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80891003640 is a wasteful number, since it uses less digits than its factorization.

80891003640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749 (or 8745 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 80891003640 in words is "eighty billion, eight hundred ninety-one million, three thousand, six hundred forty".