7647640677 has 20 divisors (see below), whose sum is σ = 11499929056. Its totient is φ = 5064654600.

The previous prime is 7647640631. The next prime is 7647640727. The reversal of 7647640677 is 7760467467.

7647640677 is a `hidden beast` number, since 76 + 476 + 40 + 67 + 7 = 666.

It is not a de Polignac number, because 7647640677 - 2⁷ = 7647640549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7647640607) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 300403 + ... + 324864.

Almost surely, 2^7647640677 is an apocalyptic number.

It is an amenable number.

7647640677 is a deficient number, since it is larger than the sum of its proper divisors (3852288379).

7647640677 is a wasteful number, since it uses less digits than its factorization.

7647640677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625430 (or 625421 counting only the distinct ones).

The product of its (nonzero) digits is 8297856, while the sum is 54.

The square root of 7647640677 is about 87450.7900307367. The cubic root of 7647640677 is about 1970.1947531787.

The spelling of 7647640677 in words is "seven billion, six hundred forty-seven million, six hundred forty thousand, six hundred seventy-seven".