7864405636 has 12 divisors (see below), whose sum is σ = 14022384012. Its totient is φ = 3858010208.

The previous prime is 7864405631. The next prime is 7864405651. The reversal of 7864405636 is 6365044687.

It can be written as a sum of positive squares in 2 ways, for example, as 3955655236 + 3908750400 = 62894^2 + 62520^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7864405636.

It is not an unprimeable number, because it can be changed into a prime (7864405631) 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, 18547915 + ... + 18548338.

It is an arithmetic number, because the mean of its divisors is an integer number (1168532001).

Almost surely, 2^7864405636 is an apocalyptic number.

It is an amenable number.

7864405636 is a deficient number, since it is larger than the sum of its proper divisors (6157978376).

7864405636 is a wasteful number, since it uses less digits than its factorization.

7864405636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37096310 (or 37096308 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The square root of 7864405636 is about 88681.4841779275. The cubic root of 7864405636 is about 1988.6360219636.

The spelling of 7864405636 in words is "seven billion, eight hundred sixty-four million, four hundred five thousand, six hundred thirty-six".