91428120 has 288 divisors, whose sum is σ = 355324320. Its totient is φ = 20321280.

The previous prime is 91428119. The next prime is 91428137. The reversal of 91428120 is 2182419.

It is a super-2 number, since 2×91428120² = 16718202253468800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1252404 + ... + 1252476.

It is an arithmetic number, because the mean of its divisors is an integer number (1233765).

Almost surely, 2^91428120 is an apocalyptic number.

91428120 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 91428120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177662160).

91428120 is an abundant number, since it is smaller than the sum of its proper divisors (263896200).

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

91428120 is a wasteful number, since it uses less digits than its factorization.

91428120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 91428120 is about 9561.8052688810. The cubic root of 91428120 is about 450.4984107297.

The spelling of 91428120 in words is "ninety-one million, four hundred twenty-eight thousand, one hundred twenty".