891513640 has 24 divisors (see below), whose sum is σ = 2006330670. Its totient is φ = 356529920.

The previous prime is 891513569. The next prime is 891513661. The reversal of 891513640 is 46315198.

It can be written as a sum of positive squares in 3 ways, for example, as 741255076 + 150258564 = 27226^2 + 12258^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 891513640.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186480 + ... + 191200.

Almost surely, 2^891513640 is an apocalyptic number.

It is an amenable number.

891513640 is an abundant number, since it is smaller than the sum of its proper divisors (1114817030).

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

891513640 is an frugal number, since it uses more digits than its factorization.

891513640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453 (or 4728 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 891513640 is about 29858.2256673098. The cubic root of 891513640 is about 962.4451700930.

The spelling of 891513640 in words is "eight hundred ninety-one million, five hundred thirteen thousand, six hundred forty".