4051720906 has 16 divisors (see below), whose sum is σ = 6357803400. Its totient is φ = 1934023168.

The previous prime is 4051720903. The next prime is 4051720909. The reversal of 4051720906 is 6090271504.

It is an interprime number because it is at equal distance from previous prime (4051720903) and next prime (4051720909).

It can be written as a sum of positive squares in 4 ways, for example, as 3005780625 + 1045940281 = 54825^2 + 32341^2 .

It is not an unprimeable number, because it can be changed into a prime (4051720903) 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, 387295 + ... + 397618.

Almost surely, 2^4051720906 is an apocalyptic number.

4051720906 is a deficient number, since it is larger than the sum of its proper divisors (2306082494).

4051720906 is a wasteful number, since it uses less digits than its factorization.

4051720906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785033.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 4051720906 is about 63653.1295852765. The cubic root of 4051720906 is about 1594.2135916196.

The spelling of 4051720906 in words is "four billion, fifty-one million, seven hundred twenty thousand, nine hundred six".