71805900840 has 64 divisors (see below), whose sum is σ = 228089338560. Its totient is φ = 18021872640.

The previous prime is 71805900833. The next prime is 71805900869. The reversal of 71805900840 is 4800950817.

It is a junction number, because it is equal to n+sod(n) for n = 71805900792 and 71805900801.

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, 17597446 + ... + 17601525.

It is an arithmetic number, because the mean of its divisors is an integer number (3563895915).

Almost surely, 2^71805900840 is an apocalyptic number.

It is an amenable number.

71805900840 is an abundant number, since it is smaller than the sum of its proper divisors (156283437720).

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

71805900840 is a wasteful number, since it uses less digits than its factorization.

71805900840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35199002 (or 35198998 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 71805900840 in words is "seventy-one billion, eight hundred five million, nine hundred thousand, eight hundred forty".