72745520 has 20 divisors (see below), whose sum is σ = 169133520. Its totient is φ = 29098176.

The previous prime is 72745459. The next prime is 72745549. The reversal of 72745520 is 2554727.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454580 + ... + 454739.

It is an arithmetic number, because the mean of its divisors is an integer number (8456676).

Almost surely, 2^72745520 is an apocalyptic number.

It is an amenable number.

72745520 is an abundant number, since it is smaller than the sum of its proper divisors (96388000).

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

72745520 is a wasteful number, since it uses less digits than its factorization.

72745520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909332 (or 909326 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 72745520 is about 8529.0984283217. The cubic root of 72745520 is about 417.4477111897.

The spelling of 72745520 in words is "seventy-two million, seven hundred forty-five thousand, five hundred twenty".