8644874861 has 32 divisors (see below), whose sum is σ = 10449395712. Its totient is φ = 6996559680.

The previous prime is 8644874827. The next prime is 8644874897. The reversal of 8644874861 is 1684784468.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8644874861 is a prime.

It is a super-2 number, since 2×8644874861² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8644874797 and 8644874806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644877861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1552895 + ... + 1558451.

It is an arithmetic number, because the mean of its divisors is an integer number (326543616).

Almost surely, 2^8644874861 is an apocalyptic number.

It is an amenable number.

8644874861 is a deficient number, since it is larger than the sum of its proper divisors (1804520851).

8644874861 is a wasteful number, since it uses less digits than its factorization.

8644874861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5769.

The product of its digits is 8257536, while the sum is 56.

The square root of 8644874861 is about 92977.8191882344. The cubic root of 8644874861 is about 2052.3569845206.

The spelling of 8644874861 in words is "eight billion, six hundred forty-four million, eight hundred seventy-four thousand, eight hundred sixty-one".