8131725840 has 80 divisors (see below), whose sum is σ = 28809548928. Its totient is φ = 1858679808.

The previous prime is 8131725803. The next prime is 8131725869. The reversal of 8131725840 is 485271318.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×8131725840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2418477 + ... + 2421836.

Almost surely, 2^8131725840 is an apocalyptic number.

8131725840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8131725840 is an abundant number, since it is smaller than the sum of its proper divisors (20677823088).

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

8131725840 is a wasteful number, since it uses less digits than its factorization.

8131725840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840336 (or 4840330 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 8131725840 is about 90176.0824165699. The cubic root of 8131725840 is about 2010.9174495429.

The spelling of 8131725840 in words is "eight billion, one hundred thirty-one million, seven hundred twenty-five thousand, eight hundred forty".