681152392 has 8 divisors (see below), whose sum is σ = 1277160750. Its totient is φ = 340576192.

The previous prime is 681152389. The next prime is 681152399. The reversal of 681152392 is 293251186.

It can be written as a sum of positive squares in only one way, i.e., 623301156 + 57851236 = 24966^2 + 7606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×681152392² = 927937162254643328, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681152399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572017 + ... + 42572032.

Almost surely, 2^681152392 is an apocalyptic number.

It is an amenable number.

681152392 is a deficient number, since it is larger than the sum of its proper divisors (596008358).

681152392 is a wasteful number, since it uses less digits than its factorization.

681152392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85144055 (or 85144051 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 681152392 is about 26098.8963751343. The cubic root of 681152392 is about 879.8624061734.

It can be divided in two parts, 68115 and 2392, that added together give a palindrome (70507).

The spelling of 681152392 in words is "six hundred eighty-one million, one hundred fifty-two thousand, three hundred ninety-two".