91098773280 has 192 divisors, whose sum is σ = 319814006400. Its totient is φ = 24219233280.

The previous prime is 91098773251. The next prime is 91098773309. The reversal of 91098773280 is 8237789019.

It is an interprime number because it is at equal distance from previous prime (91098773251) and next prime (91098773309).

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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1398066 + ... + 1461774.

It is an arithmetic number, because the mean of its divisors is an integer number (1665697950).

Almost surely, 2^91098773280 is an apocalyptic number.

91098773280 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 91098773280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159907003200).

91098773280 is an abundant number, since it is smaller than the sum of its proper divisors (228715233120).

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

91098773280 is a wasteful number, since it uses less digits than its factorization.

91098773280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64064 (or 64050 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 91098773280 in words is "ninety-one billion, ninety-eight million, seven hundred seventy-three thousand, two hundred eighty".