7894447806436 has 81 divisors (see below), whose sum is σ = 14553125561961. Its totient is φ = 3746978966304.

The previous prime is 7894447806433. The next prime is 7894447806457. The reversal of 7894447806436 is 6346087444987.

The square root of 7894447806436 is 2809706.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7064060308900 + 830387497536 = 2657830^2 + 911256^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7894447806433) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8940484051 + ... + 8940484933.

Almost surely, 2^{7894447806436} is an apocalyptic number.

7894447806436 is the 2809706-th square number.

It is an amenable number.

7894447806436 is a deficient number, since it is larger than the sum of its proper divisors (6658677755525).

7894447806436 is an frugal number, since it uses more digits than its factorization.

7894447806436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 780337152, while the sum is 70.

The spelling of 7894447806436 in words is "seven trillion, eight hundred ninety-four billion, four hundred forty-seven million, eight hundred six thousand, four hundred thirty-six".