291281264 has 40 divisors (see below), whose sum is σ = 599024160. Its totient is φ = 136736768.

The previous prime is 291281257. The next prime is 291281299. The reversal of 291281264 is 462182192.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135752 + ... + 137880.

It is an arithmetic number, because the mean of its divisors is an integer number (14975604).

Almost surely, 2^291281264 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 291281264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299512080).

291281264 is an abundant number, since it is smaller than the sum of its proper divisors (307742896).

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

291281264 is a wasteful number, since it uses less digits than its factorization.

291281264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657 (or 2651 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 291281264 is about 17066.9641119913. The cubic root of 291281264 is about 662.8839698460.

The spelling of 291281264 in words is "two hundred ninety-one million, two hundred eighty-one thousand, two hundred sixty-four".