680481881 has 4 divisors (see below), whose sum is σ = 680569764. Its totient is φ = 680394000.

The previous prime is 680481871. The next prime is 680481937. The reversal of 680481881 is 188184086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188184086 = 2 ⋅94092043.

It can be written as a sum of positive squares in 2 ways, for example, as 192071881 + 488410000 = 13859^2 + 22100^2 .

It is a cyclic number.

It is not a de Polignac number, because 680481881 - 2⁶ = 680481817 is a prime.

It is a super-2 number, since 2×680481881² = 926111180738596322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680481871) 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, 31070 + ... + 48231.

It is an arithmetic number, because the mean of its divisors is an integer number (170142441).

Almost surely, 2^680481881 is an apocalyptic number.

It is an amenable number.

680481881 is a deficient number, since it is larger than the sum of its proper divisors (87883).

680481881 is an equidigital number, since it uses as much as digits as its factorization.

680481881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87882.

The product of its (nonzero) digits is 98304, while the sum is 44.

The square root of 680481881 is about 26086.0476308696. The cubic root of 680481881 is about 879.5736058428.

The spelling of 680481881 in words is "six hundred eighty million, four hundred eighty-one thousand, eight hundred eighty-one".