7636661856 has 108 divisors (see below), whose sum is σ = 22543830036. Its totient is φ = 2542985280.

The previous prime is 7636661833. The next prime is 7636661867. The reversal of 7636661856 is 6581666367.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7705521 + ... + 7706511.

It is an arithmetic number, because the mean of its divisors is an integer number (208739167).

Almost surely, 2^7636661856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7636661856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11271915018).

7636661856 is an abundant number, since it is smaller than the sum of its proper divisors (14907168180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7636661856 is an frugal number, since it uses more digits than its factorization.

7636661856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007 (or 996 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 7636661856 is about 87387.9960635327. The cubic root of 7636661856 is about 1969.2515091353.

Multiplying 7636661856 by its sum of digits (54), we get a square (412379740224 = 642168²).

7636661856 divided by its sum of digits (54) gives a square (141419664 = 11892²).

The spelling of 7636661856 in words is "seven billion, six hundred thirty-six million, six hundred sixty-one thousand, eight hundred fifty-six".