91313730 has 80 divisors (see below), whose sum is σ = 248814720. Its totient is φ = 24025248.

The previous prime is 91313707. The next prime is 91313759. The reversal of 91313730 is 3731319.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 91313694 and 91313703.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63277 + ... + 64703.

It is an arithmetic number, because the mean of its divisors is an integer number (3110184).

Almost surely, 2^91313730 is an apocalyptic number.

91313730 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91313730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124407360).

91313730 is an abundant number, since it is smaller than the sum of its proper divisors (157500990).

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

91313730 is a wasteful number, since it uses less digits than its factorization.

91313730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 1701, while the sum is 27.

The square root of 91313730 is about 9555.8217856969. The cubic root of 91313730 is about 450.3104524380.

The spelling of 91313730 in words is "ninety-one million, three hundred thirteen thousand, seven hundred thirty".