72673291 has 4 divisors (see below), whose sum is σ = 74637472. Its totient is φ = 70709112.

The previous prime is 72673277. The next prime is 72673303. The reversal of 72673291 is 19237627.

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

It is a cyclic number.

It is not a de Polignac number, because 72673291 - 2⁷ = 72673163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1964143 = 72673291 / (7 + 2 + 6 + 7 + 3 + 2 + 9 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72673291.

It is not an unprimeable number, because it can be changed into a prime (72673241) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 982035 + ... + 982108.

It is an arithmetic number, because the mean of its divisors is an integer number (18659368).

Almost surely, 2^72673291 is an apocalyptic number.

72673291 is a deficient number, since it is larger than the sum of its proper divisors (1964181).

72673291 is a wasteful number, since it uses less digits than its factorization.

72673291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964180.

The product of its digits is 31752, while the sum is 37.

The square root of 72673291 is about 8524.8631074053. The cubic root of 72673291 is about 417.3095042115.

The spelling of 72673291 in words is "seventy-two million, six hundred seventy-three thousand, two hundred ninety-one".