681377733 has 24 divisors (see below), whose sum is σ = 995511296. Its totient is φ = 449064000.

The previous prime is 681377717. The next prime is 681377773. The reversal of 681377733 is 337773186.

It is not a de Polignac number, because 681377733 - 2⁴ = 681377717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681377713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377433 + ... + 379233.

Almost surely, 2^681377733 is an apocalyptic number.

It is an amenable number.

681377733 is a deficient number, since it is larger than the sum of its proper divisors (314133563).

681377733 is a wasteful number, since it uses less digits than its factorization.

681377733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265 (or 2262 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 681377733 is about 26103.2130780868. The cubic root of 681377733 is about 879.9594217687.

The spelling of 681377733 in words is "six hundred eighty-one million, three hundred seventy-seven thousand, seven hundred thirty-three".