72730399 has 4 divisors (see below), whose sum is σ = 83120464. Its totient is φ = 62340336.

The previous prime is 72730397. The next prime is 72730409. The reversal of 72730399 is 99303727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99303727 = 43 ⋅2309389.

It is a cyclic number.

It is not a de Polignac number, because 72730399 - 2¹ = 72730397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72730397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195022 + ... + 5195035.

It is an arithmetic number, because the mean of its divisors is an integer number (20780116).

Almost surely, 2^72730399 is an apocalyptic number.

72730399 is a deficient number, since it is larger than the sum of its proper divisors (10390065).

72730399 is a wasteful number, since it uses less digits than its factorization.

72730399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390064.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 72730399 is about 8528.2119462405. The cubic root of 72730399 is about 417.4187854027.

The spelling of 72730399 in words is "seventy-two million, seven hundred thirty thousand, three hundred ninety-nine".