72037909 has 4 divisors (see below), whose sum is σ = 75170016. Its totient is φ = 68905804.

The previous prime is 72037907. The next prime is 72037913. The reversal of 72037909 is 90973027.

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 72037909 - 2¹ = 72037907 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 (72037907) 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, 1566019 + ... + 1566064.

It is an arithmetic number, because the mean of its divisors is an integer number (18792504).

Almost surely, 2^72037909 is an apocalyptic number.

It is an amenable number.

72037909 is a deficient number, since it is larger than the sum of its proper divisors (3132107).

72037909 is a wasteful number, since it uses less digits than its factorization.

72037909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132106.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 72037909 is about 8487.5148895304. The cubic root of 72037909 is about 416.0897646682.

The spelling of 72037909 in words is "seventy-two million, thirty-seven thousand, nine hundred nine".