72292009 has 4 divisors (see below), whose sum is σ = 72610704. Its totient is φ = 71973316.

The previous prime is 72292001. The next prime is 72292021. The reversal of 72292009 is 90029227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90029227 = 149 ⋅604223.

It is a cyclic number.

It is not a de Polignac number, because 72292009 - 2³ = 72292001 is a prime.

It is a super-2 number, since 2×72292009² = 10452269130512162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72292001) 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 3 ways as a sum of consecutive naturals, for example, 159007 + ... + 159460.

It is an arithmetic number, because the mean of its divisors is an integer number (18152676).

Almost surely, 2^72292009 is an apocalyptic number.

It is an amenable number.

72292009 is a deficient number, since it is larger than the sum of its proper divisors (318695).

72292009 is a wasteful number, since it uses less digits than its factorization.

72292009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318694.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 72292009 is about 8502.4707585501. The cubic root of 72292009 is about 416.5784163676.

The spelling of 72292009 in words is "seventy-two million, two hundred ninety-two thousand, nine".