681381436 has 12 divisors (see below), whose sum is σ = 1192965760. Its totient is φ = 340534080.

The previous prime is 681381431. The next prime is 681381461. The reversal of 681381436 is 634183186.

It is a happy number.

It is a super-2 number, since 2×681381436² = 928561322650844192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681381431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29085 + ... + 46996.

Almost surely, 2^681381436 is an apocalyptic number.

It is an amenable number.

681381436 is a deficient number, since it is larger than the sum of its proper divisors (511584324).

681381436 is a wasteful number, since it uses less digits than its factorization.

681381436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78324 (or 78322 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 681381436 is about 26103.2840079558. The cubic root of 681381436 is about 879.9610158350.

The spelling of 681381436 in words is "six hundred eighty-one million, three hundred eighty-one thousand, four hundred thirty-six".