763681 has 4 divisors (see below), whose sum is σ = 771652. Its totient is φ = 755712.

The previous prime is 763673. The next prime is 763699. The reversal of 763681 is 186367.

763681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186367 = 227 ⋅821.

It can be written as a sum of positive squares in 2 ways, for example, as 147456 + 616225 = 384^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 763681 - 2³ = 763673 is a prime.

It is a super-2 number, since 2×763681² = 1166417339522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (763601) 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, 3840 + ... + 4033.

It is an arithmetic number, because the mean of its divisors is an integer number (192913).

2⁷⁶³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

763681 is a deficient number, since it is larger than the sum of its proper divisors (7971).

763681 is an equidigital number, since it uses as much as digits as its factorization.

763681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7970.

The product of its digits is 6048, while the sum is 31.

The square root of 763681 is about 873.8884368156. Note that the first 3 decimals coincide. The cubic root of 763681 is about 91.4051492039.

It can be divided in two parts, 763 and 681, that added together give a square (1444 = 38²).

The spelling of 763681 in words is "seven hundred sixty-three thousand, six hundred eighty-one".