681489390 has 32 divisors (see below), whose sum is σ = 1638403200. Its totient is φ = 181416224.

The previous prime is 681489373. The next prime is 681489401. The reversal of 681489390 is 93984186.

681489390 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1740 + ... + 36959.

It is an arithmetic number, because the mean of its divisors is an integer number (51200100).

Almost surely, 2^681489390 is an apocalyptic number.

681489390 is an abundant number, since it is smaller than the sum of its proper divisors (956913810).

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

681489390 is a wasteful number, since it uses less digits than its factorization.

681489390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39296.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 681489390 is about 26105.3517501680. The cubic root of 681489390 is about 880.0074853013.

The spelling of 681489390 in words is "six hundred eighty-one million, four hundred eighty-nine thousand, three hundred ninety".