8157206340 has 72 divisors (see below), whose sum is σ = 24752571480. Its totient is φ = 2174459904.

The previous prime is 8157206329. The next prime is 8157206341. The reversal of 8157206340 is 436027518.

8157206340 is a `hidden beast` number, since 8 + 15 + 7 + 2 + 0 + 634 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 39917124 + 8117289216 = 6318^2 + 90096^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8157206295 and 8157206304.

It is not an unprimeable number, because it can be changed into a prime (8157206341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615706 + ... + 628814.

It is an arithmetic number, because the mean of its divisors is an integer number (343785715).

Almost surely, 2^8157206340 is an apocalyptic number.

It is an amenable number.

8157206340 is an abundant number, since it is smaller than the sum of its proper divisors (16595365140).

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

8157206340 is a wasteful number, since it uses less digits than its factorization.

8157206340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16581 (or 16576 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 8157206340 is about 90317.2538333623. The cubic root of 8157206340 is about 2013.0156411313.

The spelling of 8157206340 in words is "eight billion, one hundred fifty-seven million, two hundred six thousand, three hundred forty".