3864807561 has 8 divisors (see below), whose sum is σ = 5237553664. Its totient is φ = 2534299920.

The previous prime is 3864807547. The next prime is 3864807571. The reversal of 3864807561 is 1657084683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3864807561 - 2⁷ = 3864807433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3864807561.

It is not an unprimeable number, because it can be changed into a prime (3864807511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10559401 + ... + 10559766.

It is an arithmetic number, because the mean of its divisors is an integer number (654694208).

Almost surely, 2^3864807561 is an apocalyptic number.

It is an amenable number.

3864807561 is a deficient number, since it is larger than the sum of its proper divisors (1372746103).

3864807561 is a wasteful number, since it uses less digits than its factorization.

3864807561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21119231.

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 3864807561 is about 62167.5764446387. The cubic root of 3864807561 is about 1569.3119844990.

The spelling of 3864807561 in words is "three billion, eight hundred sixty-four million, eight hundred seven thousand, five hundred sixty-one".