681088777 has 4 divisors (see below), whose sum is σ = 681141760. Its totient is φ = 681035796.

The previous prime is 681088769. The next prime is 681088813. The reversal of 681088777 is 777880186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 681088777 - 2³ = 681088769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681088747) 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, 6424 + ... + 37462.

It is an arithmetic number, because the mean of its divisors is an integer number (170285440).

Almost surely, 2^681088777 is an apocalyptic number.

It is an amenable number.

681088777 is a deficient number, since it is larger than the sum of its proper divisors (52983).

681088777 is a wasteful number, since it uses less digits than its factorization.

681088777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52982.

The product of its (nonzero) digits is 1053696, while the sum is 52.

The square root of 681088777 is about 26097.6776169835. The cubic root of 681088777 is about 879.8350142661.

The spelling of 681088777 in words is "six hundred eighty-one million, eighty-eight thousand, seven hundred seventy-seven".