2891540388 has 72 divisors (see below), whose sum is σ = 7505707104. Its totient is φ = 865631360.

The previous prime is 2891540363. The next prime is 2891540401. The reversal of 2891540388 is 8830451982.

2891540388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2891540388² = 16722011630870381088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108520 + ... + 132512.

It is an arithmetic number, because the mean of its divisors is an integer number (104245932).

Almost surely, 2^2891540388 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 2891540388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3752853552).

2891540388 is an abundant number, since it is smaller than the sum of its proper divisors (4614166716).

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

2891540388 is a wasteful number, since it uses less digits than its factorization.

2891540388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24105 (or 24092 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The square root of 2891540388 is about 53773.0451806479. The cubic root of 2891540388 is about 1424.6551561990.

The spelling of 2891540388 in words is "two billion, eight hundred ninety-one million, five hundred forty thousand, three hundred eighty-eight".