75015721000 has 128 divisors (see below), whose sum is σ = 198098784000. Its totient is φ = 26337696000.

The previous prime is 75015720953. The next prime is 75015721019. The reversal of 75015721000 is 12751057.

It is a self number, because there is not a number n which added to its sum of digits gives 75015721000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201421 + ... + 436579.

It is an arithmetic number, because the mean of its divisors is an integer number (1547646750).

Almost surely, 2^75015721000 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 75015721000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99049392000).

75015721000 is an abundant number, since it is smaller than the sum of its proper divisors (123083063000).

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

75015721000 is a wasteful number, since it uses less digits than its factorization.

75015721000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235220 (or 235206 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 28.

The spelling of 75015721000 in words is "seventy-five billion, fifteen million, seven hundred twenty-one thousand".