681562763 has 4 divisors (see below), whose sum is σ = 778928880. Its totient is φ = 584196648.

The previous prime is 681562757. The next prime is 681562769. The reversal of 681562763 is 367265186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367265186 = 2 ⋅183632593.

It is an interprime number because it is at equal distance from previous prime (681562757) and next prime (681562769).

It is not a de Polignac number, because 681562763 - 2⁴ = 681562747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681562769) 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, 48683048 + ... + 48683061.

It is an arithmetic number, because the mean of its divisors is an integer number (194732220).

Almost surely, 2^681562763 is an apocalyptic number.

681562763 is a deficient number, since it is larger than the sum of its proper divisors (97366117).

681562763 is an equidigital number, since it uses as much as digits as its factorization.

681562763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97366116.

The product of its digits is 362880, while the sum is 44.

The square root of 681562763 is about 26106.7570372116. The cubic root of 681562763 is about 880.0390663614.

The spelling of 681562763 in words is "six hundred eighty-one million, five hundred sixty-two thousand, seven hundred sixty-three".