72071570 has 16 divisors (see below), whose sum is σ = 129933720. Its totient is φ = 28783104.

The previous prime is 72071557. The next prime is 72071599. The reversal of 72071570 is 7517027.

It can be written as a sum of positive squares in 4 ways, for example, as 67453369 + 4618201 = 8213^2 + 2149^2 .

It is a super-2 number, since 2×72071570² = 10388622404529800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376 + ... + 12084.

Almost surely, 2^72071570 is an apocalyptic number.

72071570 is a deficient number, since it is larger than the sum of its proper divisors (57862150).

72071570 is a wasteful number, since it uses less digits than its factorization.

72071570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11389.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 72071570 is about 8489.4976294243. The cubic root of 72071570 is about 416.1545630353.

Adding to 72071570 its reverse (7517027), we get a palindrome (79588597).

The spelling of 72071570 in words is "seventy-two million, seventy-one thousand, five hundred seventy".