72143578 has 16 divisors (see below), whose sum is σ = 117852840. Its totient is φ = 32921856.

The previous prime is 72143537. The next prime is 72143579. The reversal of 72143578 is 87534127.

It can be written as a sum of positive squares in 4 ways, for example, as 48260809 + 23882769 = 6947^2 + 4887^2 .

It is not an unprimeable number, because it can be changed into a prime (72143579) by changing a digit.

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, 13275 + ... + 17902.

Almost surely, 2^72143578 is an apocalyptic number.

72143578 is a deficient number, since it is larger than the sum of its proper divisors (45709262).

72143578 is a wasteful number, since it uses less digits than its factorization.

72143578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31281.

The product of its digits is 47040, while the sum is 37.

The square root of 72143578 is about 8493.7375754140. The cubic root of 72143578 is about 416.2931127358.

The spelling of 72143578 in words is "seventy-two million, one hundred forty-three thousand, five hundred seventy-eight".