7677673781 has 4 divisors (see below), whose sum is σ = 7677850572. Its totient is φ = 7677496992.

The previous prime is 7677673771. The next prime is 7677673799. The reversal of 7677673781 is 1873767767.

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: 1873767767 = 661 ⋅2834747.

It can be written as a sum of positive squares in 2 ways, for example, as 6457568881 + 1220104900 = 80359^2 + 34930^2 .

It is a cyclic number.

It is not a de Polignac number, because 7677673781 - 2²² = 7673479477 is a prime.

It is a super-2 number, since 2×7677673781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7677673781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7677673771) 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, 26705 + ... + 126761.

It is an arithmetic number, because the mean of its divisors is an integer number (1919462643).

Almost surely, 2^7677673781 is an apocalyptic number.

It is an amenable number.

7677673781 is a deficient number, since it is larger than the sum of its proper divisors (176791).

7677673781 is a wasteful number, since it uses less digits than its factorization.

7677673781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176790.

The product of its digits is 14521248, while the sum is 59.

The square root of 7677673781 is about 87622.3360850417. The cubic root of 7677673781 is about 1972.7704397175.

The spelling of 7677673781 in words is "seven billion, six hundred seventy-seven million, six hundred seventy-three thousand, seven hundred eighty-one".