72159442 has 8 divisors (see below), whose sum is σ = 108431100. Its totient is φ = 36015744.

The previous prime is 72159391. The next prime is 72159443. The reversal of 72159442 is 24495127.

It can be written as a sum of positive squares in 2 ways, for example, as 58844241 + 13315201 = 7671^2 + 3649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 72159398 and 72159407.

It is not an unprimeable number, because it can be changed into a prime (72159443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30567 + ... + 32842.

Almost surely, 2^72159442 is an apocalyptic number.

72159442 is a deficient number, since it is larger than the sum of its proper divisors (36271658).

72159442 is a wasteful number, since it uses less digits than its factorization.

72159442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63980.

The product of its digits is 20160, while the sum is 34.

The square root of 72159442 is about 8494.6713885824. The cubic root of 72159442 is about 416.3236240675.

The spelling of 72159442 in words is "seventy-two million, one hundred fifty-nine thousand, four hundred forty-two".