72611720 has 32 divisors (see below), whose sum is σ = 165352320. Its totient is φ = 28693440.

The previous prime is 72611681. The next prime is 72611729. The reversal of 72611720 is 2711627.

It is a self number, because there is not a number n which added to its sum of digits gives 72611720.

It is not an unprimeable number, because it can be changed into a prime (72611729) 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, 7616 + ... + 14255.

It is an arithmetic number, because the mean of its divisors is an integer number (5167260).

Almost surely, 2^72611720 is an apocalyptic number.

It is an amenable number.

72611720 is an abundant number, since it is smaller than the sum of its proper divisors (92740600).

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

72611720 is a wasteful number, since it uses less digits than its factorization.

72611720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21965 (or 21961 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 72611720 is about 8521.2510818541. The cubic root of 72611720 is about 417.1916185213.

The spelling of 72611720 in words is "seventy-two million, six hundred eleven thousand, seven hundred twenty".