70728545520 has 100 divisors (see below), whose sum is σ = 245650739400. Its totient is φ = 18860943744.

The previous prime is 70728545501. The next prime is 70728545521. The reversal of 70728545520 is 2554582707.

70728545520 is a `hidden beast` number, since 7 + 0 + 7 + 2 + 85 + 45 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70728545521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5450970 + ... + 5463929.

It is an arithmetic number, because the mean of its divisors is an integer number (2456507394).

Almost surely, 2^70728545520 is an apocalyptic number.

It is an amenable number.

70728545520 is an abundant number, since it is smaller than the sum of its proper divisors (174922193880).

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

70728545520 is a wasteful number, since it uses less digits than its factorization.

70728545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10914924 (or 10914909 counting only the distinct ones).

The product of its (nonzero) digits is 784000, while the sum is 45.

The spelling of 70728545520 in words is "seventy billion, seven hundred twenty-eight million, five hundred forty-five thousand, five hundred twenty".