91359269820 has 480 divisors, whose sum is σ = 364132048896. Its totient is φ = 18653068800.

The previous prime is 91359269779. The next prime is 91359269839. The reversal of 91359269820 is 2896295319.

It is a happy number.

91359269820 is a `hidden beast` number, since 9 + 1 + 359 + 269 + 8 + 20 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4560025 + ... + 4580015.

Almost surely, 2^91359269820 is an apocalyptic number.

91359269820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91359269820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182066024448).

91359269820 is an abundant number, since it is smaller than the sum of its proper divisors (272772779076).

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

91359269820 is a wasteful number, since it uses less digits than its factorization.

91359269820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20063 (or 20052 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 91359269820 in words is "ninety-one billion, three hundred fifty-nine million, two hundred sixty-nine thousand, eight hundred twenty".