72501209 has 8 divisors (see below), whose sum is σ = 83744928. Its totient is φ = 62032960.

The previous prime is 72501199. The next prime is 72501229. The reversal of 72501209 is 90210527.

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

It is not a de Polignac number, because 72501209 - 2⁴ = 72501193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72501229) 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, 193667 + ... + 194040.

It is an arithmetic number, because the mean of its divisors is an integer number (10468116).

Almost surely, 2^72501209 is an apocalyptic number.

It is an amenable number.

72501209 is a deficient number, since it is larger than the sum of its proper divisors (11243719).

72501209 is a wasteful number, since it uses less digits than its factorization.

72501209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387735.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 72501209 is about 8514.7641775918. The cubic root of 72501209 is about 416.9798635773.

The spelling of 72501209 in words is "seventy-two million, five hundred one thousand, two hundred nine".