2891688390 has 32 divisors (see below), whose sum is σ = 7711169760. Its totient is φ = 771116832.

The previous prime is 2891688383. The next prime is 2891688391. The reversal of 2891688390 is 938861982.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891688391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5354709 + ... + 5355248.

It is an arithmetic number, because the mean of its divisors is an integer number (240974055).

Almost surely, 2^2891688390 is an apocalyptic number.

2891688390 is an abundant number, since it is smaller than the sum of its proper divisors (4819481370).

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

2891688390 is a wasteful number, since it uses less digits than its factorization.

2891688390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10709973 (or 10709967 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 2891688390 is about 53774.4213357987. The cubic root of 2891688390 is about 1424.6794625302.

The spelling of 2891688390 in words is "two billion, eight hundred ninety-one million, six hundred eighty-eight thousand, three hundred ninety".