71398205540 has 24 divisors (see below), whose sum is σ = 149977836792. Its totient is φ = 28551357440.

The previous prime is 71398205533. The next prime is 71398205587. The reversal of 71398205540 is 4550289317.

It can be written as a sum of positive squares in 4 ways, for example, as 5702364196 + 65695841344 = 75514^2 + 256312^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71398205491 and 71398205500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421151 + ... + 565830.

It is an arithmetic number, because the mean of its divisors is an integer number (6249076533).

Almost surely, 2^71398205540 is an apocalyptic number.

It is an amenable number.

71398205540 is an abundant number, since it is smaller than the sum of its proper divisors (78579631252).

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

71398205540 is a wasteful number, since it uses less digits than its factorization.

71398205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990607 (or 990605 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 71398205540 in words is "seventy-one billion, three hundred ninety-eight million, two hundred five thousand, five hundred forty".