71031521280 has 272 divisors, whose sum is σ = 239325160320. Its totient is φ = 17940086784.

The previous prime is 71031521269. The next prime is 71031521389. The reversal of 71031521280 is 8212513017.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18675859 + ... + 18679661.

Almost surely, 2^71031521280 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 71031521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119662580160).

71031521280 is an abundant number, since it is smaller than the sum of its proper divisors (168293639040).

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

71031521280 is an equidigital number, since it uses as much as digits as its factorization.

71031521280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862 (or 3832 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The spelling of 71031521280 in words is "seventy-one billion, thirty-one million, five hundred twenty-one thousand, two hundred eighty".