91782797364 has 18 divisors (see below), whose sum is σ = 232006515650. Its totient is φ = 30594265776.

The previous prime is 91782797341. The next prime is 91782797389. The reversal of 91782797364 is 46379728719.

It can be written as a sum of positive squares in only one way, i.e., 89658324900 + 2124472464 = 299430^2 + 46092^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×91782797364² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1274761039 + ... + 1274761110.

Almost surely, 2^91782797364 is an apocalyptic number.

It is an amenable number.

91782797364 is an abundant number, since it is smaller than the sum of its proper divisors (140223718286).

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

91782797364 is a wasteful number, since it uses less digits than its factorization.

91782797364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549522159 (or 2549522154 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 63.

The spelling of 91782797364 in words is "ninety-one billion, seven hundred eighty-two million, seven hundred ninety-seven thousand, three hundred sixty-four".