91434420 has 240 divisors, whose sum is σ = 358098048. Its totient is φ = 18973440.

The previous prime is 91434401. The next prime is 91434451. The reversal of 91434420 is 2443419.

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, 124374 + ... + 125106.

Almost surely, 2^91434420 is an apocalyptic number.

91434420 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 91434420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179049024).

91434420 is an abundant number, since it is smaller than the sum of its proper divisors (266663628).

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

91434420 is a wasteful number, since it uses less digits than its factorization.

91434420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 91434420 is about 9562.1346989048. The cubic root of 91434420 is about 450.5087579285.

Adding to 91434420 its reverse (2443419), we get a palindrome (93877839).

The spelling of 91434420 in words is "ninety-one million, four hundred thirty-four thousand, four hundred twenty".