72940609 has 4 divisors (see below), whose sum is σ = 83360704. Its totient is φ = 62520516.

The previous prime is 72940607. The next prime is 72940619. The reversal of 72940609 is 90604927.

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 72940609 - 2¹ = 72940607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72940603) 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, 5210037 + ... + 5210050.

It is an arithmetic number, because the mean of its divisors is an integer number (20840176).

Almost surely, 2^72940609 is an apocalyptic number.

It is an amenable number.

72940609 is a deficient number, since it is larger than the sum of its proper divisors (10420095).

72940609 is a wasteful number, since it uses less digits than its factorization.

72940609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420094.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 72940609 is about 8540.5274427286. The cubic root of 72940609 is about 417.8205486433.

The spelling of 72940609 in words is "seventy-two million, nine hundred forty thousand, six hundred nine".