3877604561 has 4 divisors (see below), whose sum is σ = 3972180324. Its totient is φ = 3783028800.

The previous prime is 3877604539. The next prime is 3877604573. The reversal of 3877604561 is 1654067783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1654067783 = 907 ⋅1823669.

It can be written as a sum of positive squares in 2 ways, for example, as 1156000000 + 2721604561 = 34000^2 + 52169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3877604561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3877604581) 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, 47287820 + ... + 47287901.

It is an arithmetic number, because the mean of its divisors is an integer number (993045081).

Almost surely, 2^3877604561 is an apocalyptic number.

It is an amenable number.

3877604561 is a deficient number, since it is larger than the sum of its proper divisors (94575763).

3877604561 is an equidigital number, since it uses as much as digits as its factorization.

3877604561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94575762.

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 3877604561 is about 62270.4148131358. The cubic root of 3877604561 is about 1571.0421578117.

The spelling of 3877604561 in words is "three billion, eight hundred seventy-seven million, six hundred four thousand, five hundred sixty-one".