8161757328 has 40 divisors (see below), whose sum is σ = 21091212576. Its totient is φ = 2719724800.

The previous prime is 8161757297. The next prime is 8161757347. The reversal of 8161757328 is 8237571618.

It is a happy number.

It is a super-2 number, since 2×8161757328² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136588 + ... + 187028.

Almost surely, 2^8161757328 is an apocalyptic number.

It is an amenable number.

8161757328 is an abundant number, since it is smaller than the sum of its proper divisors (12929455248).

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

8161757328 is a wasteful number, since it uses less digits than its factorization.

8161757328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53823 (or 53817 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 8161757328 is about 90342.4447754210. Note that the first 3 decimals coincide. The cubic root of 8161757328 is about 2013.3899321350.

The spelling of 8161757328 in words is "eight billion, one hundred sixty-one million, seven hundred fifty-seven thousand, three hundred twenty-eight".