2087621805 has 32 divisors (see below), whose sum is σ = 3439231488. Its totient is φ = 1080665600.

The previous prime is 2087621801. The next prime is 2087621821. The reversal of 2087621805 is 5081267802.

It is not a de Polignac number, because 2087621805 - 2² = 2087621801 is a prime.

It is a super-2 number, since 2×2087621805² = 8716329601422916050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2087621801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112540 + ... + 129770.

It is an arithmetic number, because the mean of its divisors is an integer number (107475984).

Almost surely, 2^2087621805 is an apocalyptic number.

It is an amenable number.

2087621805 is a deficient number, since it is larger than the sum of its proper divisors (1351609683).

2087621805 is a wasteful number, since it uses less digits than its factorization.

2087621805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17477.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 2087621805 is about 45690.5001614121. The cubic root of 2087621805 is about 1278.0581323769.

The spelling of 2087621805 in words is "two billion, eighty-seven million, six hundred twenty-one thousand, eight hundred five".