2891264 has 20 divisors (see below), whose sum is σ = 5777904. Its totient is φ = 1445376.

The previous prime is 2891263. The next prime is 2891281. The reversal of 2891264 is 4621982.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a d-powerful number, because it can be written as 2⁹ + 8 + 9⁶ + 1 + 2²¹ + 6 + 4⁹ .

It is a self number, because there is not a number n which added to its sum of digits gives 2891264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2312 + ... + 3335.

2^2891264 is an apocalyptic number.

It is an amenable number.

2891264 is a deficient number, since it is larger than the sum of its proper divisors (2886640).

2891264 is an frugal number, since it uses more digits than its factorization.

2891264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5665 (or 5649 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 2891264 is about 1700.3717240651. The cubic root of 2891264 is about 142.4609762847.

The spelling of 2891264 in words is "two million, eight hundred ninety-one thousand, two hundred sixty-four".