72321670 has 8 divisors (see below), whose sum is σ = 130179024. Its totient is φ = 28928664.

The previous prime is 72321659. The next prime is 72321671. The reversal of 72321670 is 7612327.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321671) 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, 3616074 + ... + 3616093.

It is an arithmetic number, because the mean of its divisors is an integer number (16272378).

Almost surely, 2^72321670 is an apocalyptic number.

72321670 is a deficient number, since it is larger than the sum of its proper divisors (57857354).

72321670 is a wasteful number, since it uses less digits than its factorization.

72321670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7232174.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 72321670 is about 8504.2148373615. The cubic root of 72321670 is about 416.6353818289.

Adding to 72321670 its reverse (7612327), we get a palindrome (79933997).

The spelling of 72321670 in words is "seventy-two million, three hundred twenty-one thousand, six hundred seventy".