91420560 has 480 divisors, whose sum is σ = 409473792. Its totient is φ = 17694720.

The previous prime is 91420541. The next prime is 91420591. The reversal of 91420560 is 6502419.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 942432 + ... + 942528.

Almost surely, 2^91420560 is an apocalyptic number.

91420560 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 91420560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204736896).

91420560 is an abundant number, since it is smaller than the sum of its proper divisors (318053232).

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

91420560 is a wasteful number, since it uses less digits than its factorization.

91420560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 91420560 is about 9561.4099378700. The cubic root of 91420560 is about 450.4859934637.

Adding to 91420560 its reverse (6502419), we get a palindrome (97922979).

The spelling of 91420560 in words is "ninety-one million, four hundred twenty thousand, five hundred sixty".