91140390 has 160 divisors (see below), whose sum is σ = 273800736. Its totient is φ = 21565440.

The previous prime is 91140389. The next prime is 91140419. The reversal of 91140390 is 9304119.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 472134 + ... + 472326.

Almost surely, 2^91140390 is an apocalyptic number.

91140390 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 91140390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136900368).

91140390 is an abundant number, since it is smaller than the sum of its proper divisors (182660346).

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

91140390 is a wasteful number, since it uses less digits than its factorization.

91140390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 91140390 is about 9546.7476137164. The cubic root of 91140390 is about 450.0253319073.

The spelling of 91140390 in words is "ninety-one million, one hundred forty thousand, three hundred ninety".