91244490740 has 24 divisors (see below), whose sum is σ = 206352925800. Its totient is φ = 33690273408.

The previous prime is 91244490731. The next prime is 91244490769. The reversal of 91244490740 is 4709444219.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20979204964 + 70265285776 = 144842^2 + 265076^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91244490691 and 91244490700.

It is a congruent number.

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, 175469915 + ... + 175470434.

It is an arithmetic number, because the mean of its divisors is an integer number (8598038575).

Almost surely, 2^91244490740 is an apocalyptic number.

It is an amenable number.

91244490740 is an abundant number, since it is smaller than the sum of its proper divisors (115108435060).

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

91244490740 is a wasteful number, since it uses less digits than its factorization.

91244490740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350940371 (or 350940369 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 91244490740 in words is "ninety-one billion, two hundred forty-four million, four hundred ninety thousand, seven hundred forty".