8157188440 has 32 divisors (see below), whose sum is σ = 18986562000. Its totient is φ = 3150361984.

The previous prime is 8157188423. The next prime is 8157188449. The reversal of 8157188440 is 448817518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8157188449) 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, 3514870 + ... + 3517189.

Almost surely, 2^8157188440 is an apocalyptic number.

It is an amenable number.

8157188440 is an abundant number, since it is smaller than the sum of its proper divisors (10829373560).

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

8157188440 is a wasteful number, since it uses less digits than its factorization.

8157188440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032099 (or 7032095 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 8157188440 is about 90317.1547381781. The cubic root of 8157188440 is about 2013.0141686907.

The spelling of 8157188440 in words is "eight billion, one hundred fifty-seven million, one hundred eighty-eight thousand, four hundred forty".