681131028 has 24 divisors (see below), whose sum is σ = 1589741440. Its totient is φ = 226981440.

The previous prime is 681131023. The next prime is 681131053. The reversal of 681131028 is 820131186.

It is a junction number, because it is equal to n+sod(n) for n = 681130986 and 681131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681131023) 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, 65208 + ... + 74928.

Almost surely, 2^681131028 is an apocalyptic number.

It is an amenable number.

681131028 is an abundant number, since it is smaller than the sum of its proper divisors (908610412).

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

681131028 is a wasteful number, since it uses less digits than its factorization.

681131028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15567 (or 15565 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 681131028 is about 26098.4870825878. The cubic root of 681131028 is about 879.8532072642.

The spelling of 681131028 in words is "six hundred eighty-one million, one hundred thirty-one thousand, twenty-eight".