681026892 has 216 divisors, whose sum is σ = 2078930448. Its totient is φ = 171924480.

The previous prime is 681026887. The next prime is 681026893. The reversal of 681026892 is 298620186.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (681026893) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12849538 + ... + 12849590.

It is an arithmetic number, because the mean of its divisors is an integer number (9624678).

Almost surely, 2^681026892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681026892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039465224).

681026892 is an abundant number, since it is smaller than the sum of its proper divisors (1397903556).

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

681026892 is a wasteful number, since it uses less digits than its factorization.

681026892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 681026892 is about 26096.4919481527. The cubic root of 681026892 is about 879.8083656407.

The spelling of 681026892 in words is "six hundred eighty-one million, twenty-six thousand, eight hundred ninety-two".