91693980 has 144 divisors (see below), whose sum is σ = 323354304. Its totient is φ = 20597760.

The previous prime is 91693967. The next prime is 91693997. The reversal of 91693980 is 8939619.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76264 + ... + 77456.

It is an arithmetic number, because the mean of its divisors is an integer number (2245516).

Almost surely, 2^91693980 is an apocalyptic number.

91693980 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 91693980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161677152).

91693980 is an abundant number, since it is smaller than the sum of its proper divisors (231660324).

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

91693980 is a wasteful number, since it uses less digits than its factorization.

91693980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 1271 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 91693980 is about 9575.6973636388. The cubic root of 91693980 is about 450.9346499806.

The spelling of 91693980 in words is "ninety-one million, six hundred ninety-three thousand, nine hundred eighty".