81790780950 has 36 divisors (see below), whose sum is σ = 219744566028. Its totient is φ = 21810874800.

The previous prime is 81790780931. The next prime is 81790780979. The reversal of 81790780950 is 5908709718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 90878196 + ... + 90879095.

It is an arithmetic number, because the mean of its divisors is an integer number (6104015723).

Almost surely, 2^81790780950 is an apocalyptic number.

81790780950 is an abundant number, since it is smaller than the sum of its proper divisors (137953785078).

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

81790780950 is a wasteful number, since it uses less digits than its factorization.

81790780950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181757309 (or 181757301 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The spelling of 81790780950 in words is "eighty-one billion, seven hundred ninety million, seven hundred eighty thousand, nine hundred fifty".