72647520 has 96 divisors (see below), whose sum is σ = 249661440. Its totient is φ = 17610240.

The previous prime is 72647513. The next prime is 72647521. The reversal of 72647520 is 2574627.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72647521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1600 + ... + 12159.

It is an arithmetic number, because the mean of its divisors is an integer number (2600640).

Almost surely, 2^72647520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72647520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124830720).

72647520 is an abundant number, since it is smaller than the sum of its proper divisors (177013920).

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

72647520 is a wasteful number, since it uses less digits than its factorization.

72647520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13788 (or 13780 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 72647520 is about 8523.3514535070. The cubic root of 72647520 is about 417.2601703844.

The spelling of 72647520 in words is "seventy-two million, six hundred forty-seven thousand, five hundred twenty".