72040720 has 40 divisors (see below), whose sum is σ = 168274944. Its totient is φ = 28682112.

The previous prime is 72040693. The next prime is 72040721. The reversal of 72040720 is 2704027.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 72040691 and 72040700.

It is not an unprimeable number, because it can be changed into a prime (72040721) 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, 16177 + ... + 20143.

Almost surely, 2^72040720 is an apocalyptic number.

It is an amenable number.

72040720 is an abundant number, since it is smaller than the sum of its proper divisors (96234224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72040720 is a wasteful number, since it uses less digits than its factorization.

72040720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207 (or 4201 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 72040720 is about 8487.6804840899. The cubic root of 72040720 is about 416.0951766943.

Adding to 72040720 its reverse (2704027), we get a palindrome (74744747).

The spelling of 72040720 in words is "seventy-two million, forty thousand, seven hundred twenty".