72320998 has 4 divisors (see below), whose sum is σ = 108481500. Its totient is φ = 36160498.

The previous prime is 72320987. The next prime is 72321001. The reversal of 72320998 is 89902327.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 72320998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18080248 + ... + 18080251.

It is an arithmetic number, because the mean of its divisors is an integer number (27120375).

Almost surely, 2^72320998 is an apocalyptic number.

72320998 is a deficient number, since it is larger than the sum of its proper divisors (36160502).

72320998 is a wasteful number, since it uses less digits than its factorization.

72320998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36160501.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 72320998 is about 8504.1753274495. The cubic root of 72320998 is about 416.6340913911.

The spelling of 72320998 in words is "seventy-two million, three hundred twenty thousand, nine hundred ninety-eight".