2891688392 has 8 divisors (see below), whose sum is σ = 5421915750. Its totient is φ = 1445844192.

The previous prime is 2891688391. The next prime is 2891688407. The reversal of 2891688392 is 2938861982.

2891688392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2007577636 + 884110756 = 44806^2 + 29734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180730517 + ... + 180730532.

Almost surely, 2^2891688392 is an apocalyptic number.

It is an amenable number.

2891688392 is a deficient number, since it is larger than the sum of its proper divisors (2530227358).

2891688392 is a wasteful number, since it uses less digits than its factorization.

2891688392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361461055 (or 361461051 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 56.

The square root of 2891688392 is about 53774.4213543949. The cubic root of 2891688392 is about 1424.6794628587.

The spelling of 2891688392 in words is "two billion, eight hundred ninety-one million, six hundred eighty-eight thousand, three hundred ninety-two".