7213643578 has 4 divisors (see below), whose sum is σ = 10820465370. Its totient is φ = 3606821788.

The previous prime is 7213643539. The next prime is 7213643651. The reversal of 7213643578 is 8753463127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8753463127 = 46199 ⋅189473.

It can be written as a sum of positive squares in only one way, i.e., 6861968569 + 351675009 = 82837^2 + 18753^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1803410893 + ... + 1803410896.

Almost surely, 2^7213643578 is an apocalyptic number.

7213643578 is a deficient number, since it is larger than the sum of its proper divisors (3606821792).

7213643578 is a wasteful number, since it uses less digits than its factorization.

7213643578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606821791.

The product of its digits is 846720, while the sum is 46.

The square root of 7213643578 is about 84933.1712465748. The cubic root of 7213643578 is about 1932.1976968000.

The spelling of 7213643578 in words is "seven billion, two hundred thirteen million, six hundred forty-three thousand, five hundred seventy-eight".