681495338428 has 24 divisors (see below), whose sum is σ = 1262854396944. Its totient is φ = 320682451200.

The previous prime is 681495338423. The next prime is 681495338441. The reversal of 681495338428 is 824833594186.

It is a super-2 number, since 2×681495338428² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681495338423) 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, 727243 + ... + 1375453.

It is an arithmetic number, because the mean of its divisors is an integer number (52618933206).

Almost surely, 2^681495338428 is an apocalyptic number.

681495338428 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

681495338428 is a deficient number, since it is larger than the sum of its proper divisors (581359058516).

681495338428 is a wasteful number, since it uses less digits than its factorization.

681495338428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663693 (or 663691 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 61.

The spelling of 681495338428 in words is "six hundred eighty-one billion, four hundred ninety-five million, three hundred thirty-eight thousand, four hundred twenty-eight".