72043109 has 8 divisors (see below), whose sum is σ = 73929240. Its totient is φ = 70163200.

The previous prime is 72043073. The next prime is 72043121. The reversal of 72043109 is 90134027.

It can be written as a sum of positive squares in 4 ways, for example, as 386884 + 71656225 = 622^2 + 8465^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72043109 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 (72043129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30047 + ... + 32355.

It is an arithmetic number, because the mean of its divisors is an integer number (9241155).

Almost surely, 2^72043109 is an apocalyptic number.

It is an amenable number.

72043109 is a deficient number, since it is larger than the sum of its proper divisors (1886131).

72043109 is a wasteful number, since it uses less digits than its factorization.

72043109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72043109 is about 8487.8212163075. The cubic root of 72043109 is about 416.0997761319.

The spelling of 72043109 in words is "seventy-two million, forty-three thousand, one hundred nine".