91450820 has 24 divisors (see below), whose sum is σ = 203344344. Its totient is φ = 34428416.

The previous prime is 91450817. The next prime is 91450831. The reversal of 91450820 is 2805419.

It can be written as a sum of positive squares in 4 ways, for example, as 4700224 + 86750596 = 2168^2 + 9314^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134147 + ... + 134826.

It is an arithmetic number, because the mean of its divisors is an integer number (8472681).

Almost surely, 2^91450820 is an apocalyptic number.

It is an amenable number.

91450820 is an abundant number, since it is smaller than the sum of its proper divisors (111893524).

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

91450820 is a wasteful number, since it uses less digits than its factorization.

91450820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268999 (or 268997 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 91450820 is about 9562.9922095545. The cubic root of 91450820 is about 450.5356912648.

The spelling of 91450820 in words is "ninety-one million, four hundred fifty thousand, eight hundred twenty".