72399667 has 8 divisors (see below), whose sum is σ = 74012400. Its totient is φ = 70799904.

The previous prime is 72399641. The next prime is 72399697. The reversal of 72399667 is 76699327.

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

It is a cyclic number.

It is not a de Polignac number, because 72399667 - 2¹⁹ = 71875379 is a prime.

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 72399667.

It is not an unprimeable number, because it can be changed into a prime (72399637) 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 7 ways as a sum of consecutive naturals, for example, 8509 + ... + 14737.

It is an arithmetic number, because the mean of its divisors is an integer number (9251550).

Almost surely, 2^72399667 is an apocalyptic number.

72399667 is a deficient number, since it is larger than the sum of its proper divisors (1612733).

72399667 is a wasteful number, since it uses less digits than its factorization.

72399667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6485.

The product of its digits is 857304, while the sum is 49.

The square root of 72399667 is about 8508.7993865175. The cubic root of 72399667 is about 416.7851047484.

The spelling of 72399667 in words is "seventy-two million, three hundred ninety-nine thousand, six hundred sixty-seven".