72156346 has 4 divisors (see below), whose sum is σ = 108234522. Its totient is φ = 36078172.

The previous prime is 72156323. The next prime is 72156361. The reversal of 72156346 is 64365127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53450721 + 18705625 = 7311^2 + 4325^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18039085 + ... + 18039088.

Almost surely, 2^72156346 is an apocalyptic number.

72156346 is a deficient number, since it is larger than the sum of its proper divisors (36078176).

72156346 is a wasteful number, since it uses less digits than its factorization.

72156346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36078175.

The product of its digits is 30240, while the sum is 34.

The square root of 72156346 is about 8494.4891547403. The cubic root of 72156346 is about 416.3176698623.

The spelling of 72156346 in words is "seventy-two million, one hundred fifty-six thousand, three hundred forty-six".