8187640782 has 16 divisors (see below), whose sum is σ = 16437548160. Its totient is φ = 2718835832.

The previous prime is 8187640777. The next prime is 8187640787. The reversal of 8187640782 is 2870467818.

It is an interprime number because it is at equal distance from previous prime (8187640777) and next prime (8187640787).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8187640787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2592732 + ... + 2595887.

It is an arithmetic number, because the mean of its divisors is an integer number (1027346760).

Almost surely, 2^8187640782 is an apocalyptic number.

8187640782 is an abundant number, since it is smaller than the sum of its proper divisors (8249907378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8187640782 is a wasteful number, since it uses less digits than its factorization.

8187640782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188887.

The product of its (nonzero) digits is 1204224, while the sum is 51.

The square root of 8187640782 is about 90485.5832826423. The cubic root of 8187640782 is about 2015.5160466931.

The spelling of 8187640782 in words is "eight billion, one hundred eighty-seven million, six hundred forty thousand, seven hundred eighty-two".