72204309 has 12 divisors (see below), whose sum is σ = 104572416. Its totient is φ = 48008232.

The previous prime is 72204281. The next prime is 72204347. The reversal of 72204309 is 90340227.

72204309 is a `hidden beast` number, since 7 + 220 + 430 + 9 = 666.

It is not a de Polignac number, because 72204309 - 2¹² = 72200213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72204109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7027 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (8714368).

Almost surely, 2^72204309 is an apocalyptic number.

It is an amenable number.

72204309 is a deficient number, since it is larger than the sum of its proper divisors (32368107).

72204309 is a wasteful number, since it uses less digits than its factorization.

72204309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21336 (or 21333 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 72204309 is about 8497.3118690560. The cubic root of 72204309 is about 416.4098928516.

The spelling of 72204309 in words is "seventy-two million, two hundred four thousand, three hundred nine".