91404450 has 72 divisors (see below), whose sum is σ = 254702448. Its totient is φ = 24371280.

The previous prime is 91404449. The next prime is 91404473. The reversal of 91404450 is 5440419.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

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 35 ways as a sum of consecutive naturals, for example, 8389 + ... + 15911.

It is an arithmetic number, because the mean of its divisors is an integer number (3537534).

Almost surely, 2^91404450 is an apocalyptic number.

91404450 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 91404450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127351224).

91404450 is an abundant number, since it is smaller than the sum of its proper divisors (163297998).

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

91404450 is a wasteful number, since it uses less digits than its factorization.

91404450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550 (or 7533 counting only the distinct ones).

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

The square root of 91404450 is about 9560.5674517782. The cubic root of 91404450 is about 450.4595305773.

Adding to 91404450 its reverse (5440419), we get a palindrome (96844869).

The spelling of 91404450 in words is "ninety-one million, four hundred four thousand, four hundred fifty".