91442773920 has 48 divisors (see below), whose sum is σ = 288044739360. Its totient is φ = 24384739584.

The previous prime is 91442773913. The next prime is 91442773943. The reversal of 91442773920 is 2937724419.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 91442773920.

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, 95252410 + ... + 95253369.

It is an arithmetic number, because the mean of its divisors is an integer number (6000932070).

Almost surely, 2^91442773920 is an apocalyptic number.

It is an amenable number.

91442773920 is an abundant number, since it is smaller than the sum of its proper divisors (196601965440).

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

91442773920 is a wasteful number, since it uses less digits than its factorization.

91442773920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190505797 (or 190505789 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 91442773920 in words is "ninety-one billion, four hundred forty-two million, seven hundred seventy-three thousand, nine hundred twenty".