91214367840 has 192 divisors, whose sum is σ = 333131097600. Its totient is φ = 23266248192.

The previous prime is 91214367809. The next prime is 91214367883. The reversal of 91214367840 is 4876341219.

91214367840 is a `hidden beast` number, since 91 + 21 + 436 + 78 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 359650 + ... + 558369.

It is an arithmetic number, because the mean of its divisors is an integer number (1735057800).

Almost surely, 2^91214367840 is an apocalyptic number.

91214367840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91214367840 is an abundant number, since it is smaller than the sum of its proper divisors (241916729760).

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

91214367840 is a wasteful number, since it uses less digits than its factorization.

91214367840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918066 (or 918052 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 91214367840 in words is "ninety-one billion, two hundred fourteen million, three hundred sixty-seven thousand, eight hundred forty".