91912442804640 has 96 divisors (see below), whose sum is σ = 321693549831360. Its totient is φ = 24509984746752.

The previous prime is 91912442804587. The next prime is 91912442804719. The reversal of 91912442804640 is 4640824421919.

91912442804640 is a `hidden beast` number, since 9 + 19 + 124 + 42 + 8 + 0 + 464 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10638009894 + ... + 10638018533.

It is an arithmetic number, because the mean of its divisors is an integer number (3350974477410).

Almost surely, 2^{91912442804640} is an apocalyptic number.

91912442804640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91912442804640 is an abundant number, since it is smaller than the sum of its proper divisors (229781107026720).

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

91912442804640 is a wasteful number, since it uses less digits than its factorization.

91912442804640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21276028451 (or 21276028437 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 91912442804640 in words is "ninety-one trillion, nine hundred twelve billion, four hundred forty-two million, eight hundred four thousand, six hundred forty".