3765978647 has 2 divisors, whose sum is σ = 3765978648. Its totient is φ = 3765978646.

The previous prime is 3765978637. The next prime is 3765978701. The reversal of 3765978647 is 7468795673.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3765978647 - 2⁶ = 3765978583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3765978647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3765978607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1882989323 + 1882989324.

It is an arithmetic number, because the mean of its divisors is an integer number (1882989324).

Almost surely, 2^3765978647 is an apocalyptic number.

3765978647 is a deficient number, since it is larger than the sum of its proper divisors (1).

3765978647 is an equidigital number, since it uses as much as digits as its factorization.

3765978647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 62.

The square root of 3765978647 is about 61367.5699942567. The cubic root of 3765978647 is about 1555.8197649598.

The spelling of 3765978647 in words is "three billion, seven hundred sixty-five million, nine hundred seventy-eight thousand, six hundred forty-seven".