7220406506 has 4 divisors (see below), whose sum is σ = 10830609762. Its totient is φ = 3610203252.

The previous prime is 7220406497. The next prime is 7220406521. The reversal of 7220406506 is 6056040227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5137305625 + 2083100881 = 71675^2 + 45641^2 .

It is a super-2 number, since 2×7220406506² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805101625 + ... + 1805101628.

Almost surely, 2^7220406506 is an apocalyptic number.

7220406506 is a deficient number, since it is larger than the sum of its proper divisors (3610203256).

7220406506 is a wasteful number, since it uses less digits than its factorization.

7220406506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610203255.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 7220406506 is about 84972.9751509267. The cubic root of 7220406506 is about 1932.8013322246.

The spelling of 7220406506 in words is "seven billion, two hundred twenty million, four hundred six thousand, five hundred six".