2291238864 has 30 divisors (see below), whose sum is σ = 6412286946. Its totient is φ = 763746240.

The previous prime is 2291238847. The next prime is 2291238893. The reversal of 2291238864 is 4688321922.

It can be written as a sum of positive squares in only one way, i.e., 1918440000 + 372798864 = 43800^2 + 19308^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7955547 + ... + 7955834.

Almost surely, 2^2291238864 is an apocalyptic number.

2291238864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2291238864 is an abundant number, since it is smaller than the sum of its proper divisors (4121048082).

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

2291238864 is a wasteful number, since it uses less digits than its factorization.

2291238864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15911395 (or 15911386 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 2291238864 is about 47866.8869261413. The cubic root of 2291238864 is about 1318.3279379669.

It can be divided in two parts, 22912 and 38864, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 2291238864 in words is "two billion, two hundred ninety-one million, two hundred thirty-eight thousand, eight hundred sixty-four".