2621890087 has 4 divisors (see below), whose sum is σ = 2712300120. Its totient is φ = 2531480056.

The previous prime is 2621890081. The next prime is 2621890111. The reversal of 2621890087 is 7800981262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7800981262 = 2 ⋅3900490631.

It is a cyclic number.

It is not a de Polignac number, because 2621890087 - 2¹¹ = 2621888039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621890081) 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 3 ways as a sum of consecutive naturals, for example, 45204973 + ... + 45205030.

It is an arithmetic number, because the mean of its divisors is an integer number (678075030).

Almost surely, 2^2621890087 is an apocalyptic number.

2621890087 is a deficient number, since it is larger than the sum of its proper divisors (90410033).

2621890087 is an equidigital number, since it uses as much as digits as its factorization.

2621890087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90410032.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 2621890087 is about 51204.3951922098. The cubic root of 2621890087 is about 1378.9171101129.

The spelling of 2621890087 in words is "two billion, six hundred twenty-one million, eight hundred ninety thousand, eighty-seven".