8290640781 has 12 divisors (see below), whose sum is σ = 11996350080. Its totient is φ = 5517410760.

The previous prime is 8290640779. The next prime is 8290640783. The reversal of 8290640781 is 1870460928.

8290640781 is a `hidden beast` number, since 82 + 90 + 6 + 407 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (8290640779) and next prime (8290640783).

It is not a de Polignac number, because 8290640781 - 2¹ = 8290640779 is a prime.

It is a super-2 number, since 2×8290640781² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8290640783) 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 11 ways as a sum of consecutive naturals, for example, 801501 + ... + 811778.

It is an arithmetic number, because the mean of its divisors is an integer number (999695840).

Almost surely, 2^8290640781 is an apocalyptic number.

It is an amenable number.

8290640781 is a deficient number, since it is larger than the sum of its proper divisors (3705709299).

8290640781 is a wasteful number, since it uses less digits than its factorization.

8290640781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613856 (or 1613853 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 8290640781 is about 91052.9559157746. The cubic root of 8290640781 is about 2023.9325395458.

The spelling of 8290640781 in words is "eight billion, two hundred ninety million, six hundred forty thousand, seven hundred eighty-one".