72871528 has 8 divisors (see below), whose sum is σ = 136634130. Its totient is φ = 36435760.

The previous prime is 72871511. The next prime is 72871529. The reversal of 72871528 is 82517827.

It can be written as a sum of positive squares in only one way, i.e., 41757444 + 31114084 = 6462^2 + 5578^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (72871529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4554463 + ... + 4554478.

Almost surely, 2^72871528 is an apocalyptic number.

It is an amenable number.

72871528 is a deficient number, since it is larger than the sum of its proper divisors (63762602).

72871528 is a wasteful number, since it uses less digits than its factorization.

72871528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108947 (or 9108943 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 72871528 is about 8536.4821794461. The cubic root of 72871528 is about 417.6886030392.

The spelling of 72871528 in words is "seventy-two million, eight hundred seventy-one thousand, five hundred twenty-eight".