72349999 has 4 divisors (see below), whose sum is σ = 72378664. Its totient is φ = 72321336.

The previous prime is 72349993. The next prime is 72350009. The reversal of 72349999 is 99994327.

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 72349999 - 2²⁵ = 38795567 is a prime.

It is a Duffinian number.

72349999 is a modest number, since divided by 9999 gives 7234 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72349993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10137 + ... + 15730.

It is an arithmetic number, because the mean of its divisors is an integer number (18094666).

Almost surely, 2^72349999 is an apocalyptic number.

72349999 is a deficient number, since it is larger than the sum of its proper divisors (28665).

72349999 is a wasteful number, since it uses less digits than its factorization.

72349999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28664.

The product of its digits is 1102248, while the sum is 52.

The square root of 72349999 is about 8505.8802601494. The cubic root of 72349999 is about 416.6897745762.

The spelling of 72349999 in words is "seventy-two million, three hundred forty-nine thousand, nine hundred ninety-nine".