681741998 has 16 divisors (see below), whose sum is σ = 1192552800. Its totient is φ = 292174848.

The previous prime is 681741979. The next prime is 681742001. The reversal of 681741998 is 899147186.

It is a congruent number.

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, 496211 + ... + 497582.

It is an arithmetic number, because the mean of its divisors is an integer number (74534550).

Almost surely, 2^681741998 is an apocalyptic number.

681741998 is a deficient number, since it is larger than the sum of its proper divisors (510810802).

681741998 is an equidigital number, since it uses as much as digits as its factorization.

681741998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993816 (or 993802 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 681741998 is about 26110.1895435479. The cubic root of 681741998 is about 880.1162028023.

The spelling of 681741998 in words is "six hundred eighty-one million, seven hundred forty-one thousand, nine hundred ninety-eight".