681776146 has 4 divisors (see below), whose sum is σ = 1022664222. Its totient is φ = 340888072.

The previous prime is 681776141. The next prime is 681776191. The reversal of 681776146 is 641677186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 605406025 + 76370121 = 24605^2 + 8739^2 .

It is a super-2 number, since 2×681776146² = 929637426509226632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681776096 and 681776105.

It is not an unprimeable number, because it can be changed into a prime (681776141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170444035 + ... + 170444038.

Almost surely, 2^681776146 is an apocalyptic number.

681776146 is a deficient number, since it is larger than the sum of its proper divisors (340888076).

681776146 is a wasteful number, since it uses less digits than its factorization.

681776146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340888075.

The product of its digits is 338688, while the sum is 46.

The square root of 681776146 is about 26110.8434563114. The cubic root of 681776146 is about 880.1308973673.

The spelling of 681776146 in words is "six hundred eighty-one million, seven hundred seventy-six thousand, one hundred forty-six".