2391778087 has 8 divisors (see below), whose sum is σ = 2457429296. Its totient is φ = 2326180032.

The previous prime is 2391778063. The next prime is 2391778099. The reversal of 2391778087 is 7808771932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2391778087 - 2⁷ = 2391777959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391778187) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 88468 + ... + 112294.

It is an arithmetic number, because the mean of its divisors is an integer number (307178662).

Almost surely, 2^2391778087 is an apocalyptic number.

2391778087 is a deficient number, since it is larger than the sum of its proper divisors (65651209).

2391778087 is a wasteful number, since it uses less digits than its factorization.

2391778087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26577.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 2391778087 is about 48905.8083155774. The cubic root of 2391778087 is about 1337.3352566414.

The spelling of 2391778087 in words is "two billion, three hundred ninety-one million, seven hundred seventy-eight thousand, eighty-seven".