91254420 has 72 divisors (see below), whose sum is σ = 277719624. Its totient is φ = 24254208.

The previous prime is 91254389. The next prime is 91254431. The reversal of 91254420 is 2445219.

It can be written as a sum of positive squares in 4 ways, for example, as 20088324 + 71166096 = 4482^2 + 8436^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70822 + ... + 72098.

It is an arithmetic number, because the mean of its divisors is an integer number (3857217).

Almost surely, 2^91254420 is an apocalyptic number.

91254420 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 91254420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138859812).

91254420 is an abundant number, since it is smaller than the sum of its proper divisors (186465204).

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

91254420 is a wasteful number, since it uses less digits than its factorization.

91254420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 91254420 is about 9552.7179378437. The cubic root of 91254420 is about 450.2129362615.

Adding to 91254420 its reverse (2445219), we get a palindrome (93699639).

The spelling of 91254420 in words is "ninety-one million, two hundred fifty-four thousand, four hundred twenty".