72991803 has 4 divisors (see below), whose sum is σ = 97322408. Its totient is φ = 48661200.

The previous prime is 72991801. The next prime is 72991817. The reversal of 72991803 is 30819927.

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

It is not a de Polignac number, because 72991803 - 2¹ = 72991801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72991801) 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, 12165298 + ... + 12165303.

It is an arithmetic number, because the mean of its divisors is an integer number (24330602).

Almost surely, 2^72991803 is an apocalyptic number.

72991803 is a deficient number, since it is larger than the sum of its proper divisors (24330605).

72991803 is a wasteful number, since it uses less digits than its factorization.

72991803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24330604.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 72991803 is about 8543.5240387091. The cubic root of 72991803 is about 417.9182761104.

The spelling of 72991803 in words is "seventy-two million, nine hundred ninety-one thousand, eight hundred three".