681787432 has 8 divisors (see below), whose sum is σ = 1278351450. Its totient is φ = 340893712.

The previous prime is 681787429. The next prime is 681787439. The reversal of 681787432 is 234787186.

It can be written as a sum of positive squares in only one way, i.e., 681523236 + 264196 = 26106^2 + 514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (681787439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42611707 + ... + 42611722.

Almost surely, 2^681787432 is an apocalyptic number.

It is an amenable number.

681787432 is a deficient number, since it is larger than the sum of its proper divisors (596564018).

681787432 is a wasteful number, since it uses less digits than its factorization.

681787432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85223435 (or 85223431 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 681787432 is about 26111.0595725260. The cubic root of 681787432 is about 880.1357538501.

It can be divided in two parts, 6817 and 87432, that added together give a palindrome (94249).

The spelling of 681787432 in words is "six hundred eighty-one million, seven hundred eighty-seven thousand, four hundred thirty-two".