7221500008 has 8 divisors (see below), whose sum is σ = 13540312530. Its totient is φ = 3610750000.

The previous prime is 7221499997. The next prime is 7221500009. The reversal of 7221500008 is 8000051227.

It can be written as a sum of positive squares in only one way, i.e., 5491106404 + 1730393604 = 74102^2 + 41598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (7221500009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451343743 + ... + 451343758.

Almost surely, 2^7221500008 is an apocalyptic number.

It is an amenable number.

7221500008 is a deficient number, since it is larger than the sum of its proper divisors (6318812522).

7221500008 is a wasteful number, since it uses less digits than its factorization.

7221500008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902687507 (or 902687503 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 7221500008 is about 84979.4093177871. The cubic root of 7221500008 is about 1932.8988990045.

The spelling of 7221500008 in words is "seven billion, two hundred twenty-one million, five hundred thousand, eight".