72890170 has 8 divisors (see below), whose sum is σ = 131202324. Its totient is φ = 29156064.

The previous prime is 72890159. The next prime is 72890173. The reversal of 72890170 is 7109827.

It can be written as a sum of positive squares in 2 ways, for example, as 72880369 + 9801 = 8537^2 + 99^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72890173) 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 3 ways as a sum of consecutive naturals, for example, 3644499 + ... + 3644518.

Almost surely, 2^72890170 is an apocalyptic number.

72890170 is a deficient number, since it is larger than the sum of its proper divisors (58312154).

72890170 is a wasteful number, since it uses less digits than its factorization.

72890170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7289024.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 72890170 is about 8537.5740113922. The cubic root of 72890170 is about 417.7242177127.

Adding to 72890170 its reverse (7109827), we get a palindrome (79999997).

The spelling of 72890170 in words is "seventy-two million, eight hundred ninety thousand, one hundred seventy".