8090781 has 4 divisors (see below), whose sum is σ = 10787712. Its totient is φ = 5393852.

The previous prime is 8090777. The next prime is 8090801. The reversal of 8090781 is 1870908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8090781 - 2² = 8090777 is a prime.

It is a super-2 number, since 2×8090781² = 130921474379922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8090701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1348461 + ... + 1348466.

It is an arithmetic number, because the mean of its divisors is an integer number (2696928).

Almost surely, 2^8090781 is an apocalyptic number.

It is an amenable number.

8090781 is a deficient number, since it is larger than the sum of its proper divisors (2696931).

8090781 is a wasteful number, since it uses less digits than its factorization.

8090781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2696930.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 8090781 is about 2844.4298198409. The cubic root of 8090781 is about 200.7536647134.

The spelling of 8090781 in words is "eight million, ninety thousand, seven hundred eighty-one".