721624226 has 16 divisors (see below), whose sum is σ = 1120807800. Its totient is φ = 348044928.

The previous prime is 721624223. The next prime is 721624259. The reversal of 721624226 is 622426127.

It can be written as a sum of positive squares in 4 ways, for example, as 720976201 + 648025 = 26851^2 + 805^2 .

It is a junction number, because it is equal to n+sod(n) for n = 721624192 and 721624201.

It is not an unprimeable number, because it can be changed into a prime (721624223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63980 + ... + 74408.

Almost surely, 2^721624226 is an apocalyptic number.

721624226 is a deficient number, since it is larger than the sum of its proper divisors (399183574).

721624226 is a wasteful number, since it uses less digits than its factorization.

721624226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11653.

The product of its digits is 16128, while the sum is 32.

The square root of 721624226 is about 26863.0643449328. The cubic root of 721624226 is about 896.9544074229.

The spelling of 721624226 in words is "seven hundred twenty-one million, six hundred twenty-four thousand, two hundred twenty-six".