91449388836 has 81 divisors (see below), whose sum is σ = 250377971571. Its totient is φ = 28131015744.

The previous prime is 91449388783. The next prime is 91449388861. The reversal of 91449388836 is 63888394419.

The square root of 91449388836 is 302406.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 33271948836 + 58177440000 = 182406^2 + 241200^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23585730 + ... + 23589606.

Almost surely, 2^91449388836 is an apocalyptic number.

91449388836 is the 302406-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91449388836

91449388836 is an abundant number, since it is smaller than the sum of its proper divisors (158928582735).

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

91449388836 is a wasteful number, since it uses less digits than its factorization.

91449388836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790 (or 3895 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 91449388836 in words is "ninety-one billion, four hundred forty-nine million, three hundred eighty-eight thousand, eight hundred thirty-six".