72958309 has 4 divisors (see below), whose sum is σ = 76798240. Its totient is φ = 69118380.

The previous prime is 72958307. The next prime is 72958331. The reversal of 72958309 is 90385927.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72958309 - 2¹ = 72958307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72958307) 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, 1919937 + ... + 1919974.

It is an arithmetic number, because the mean of its divisors is an integer number (19199560).

Almost surely, 2^72958309 is an apocalyptic number.

It is an amenable number.

72958309 is a deficient number, since it is larger than the sum of its proper divisors (3839931).

72958309 is a wasteful number, since it uses less digits than its factorization.

72958309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839930.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 72958309 is about 8541.5636156385. The cubic root of 72958309 is about 417.8543424641.

The spelling of 72958309 in words is "seventy-two million, nine hundred fifty-eight thousand, three hundred nine".