3978795677 has 4 divisors (see below), whose sum is σ = 4075839516. Its totient is φ = 3881751840.

The previous prime is 3978795673. The next prime is 3978795697. The reversal of 3978795677 is 7765978793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7765978793 = 71 ⋅109379983.

It can be written as a sum of positive squares in 2 ways, for example, as 644195161 + 3334600516 = 25381^2 + 57746^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978795677 - 2² = 3978795673 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 (3978795671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48521858 + ... + 48521939.

It is an arithmetic number, because the mean of its divisors is an integer number (1018959879).

Almost surely, 2^3978795677 is an apocalyptic number.

It is an amenable number.

3978795677 is a deficient number, since it is larger than the sum of its proper divisors (97043839).

3978795677 is an equidigital number, since it uses as much as digits as its factorization.

3978795677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97043838.

The product of its digits is 140026320, while the sum is 68.

The square root of 3978795677 is about 63077.6955587314. The cubic root of 3978795677 is about 1584.5911004572.

The spelling of 3978795677 in words is "three billion, nine hundred seventy-eight million, seven hundred ninety-five thousand, six hundred seventy-seven".