2991232638 has 40 divisors (see below), whose sum is σ = 6734419560. Its totient is φ = 992340720.

The previous prime is 2991232619. The next prime is 2991232669. The reversal of 2991232638 is 8362321992.

It is a happy number.

2991232638 is a `hidden beast` number, since 2 + 9 + 9 + 1 + 2 + 3 + 2 + 638 = 666.

2991232638 is nontrivially palindromic in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 2991232593 and 2991232602.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 9573 + ... + 77936.

It is an arithmetic number, because the mean of its divisors is an integer number (168360489).

Almost surely, 2^2991232638 is an apocalyptic number.

2991232638 is an abundant number, since it is smaller than the sum of its proper divisors (3743186922).

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

2991232638 is a wasteful number, since it uses less digits than its factorization.

2991232638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87734 (or 87725 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 2991232638 is about 54692.1624915307. The cubic root of 2991232638 is about 1440.8432300863.

The spelling of 2991232638 in words is "two billion, nine hundred ninety-one million, two hundred thirty-two thousand, six hundred thirty-eight".