91890700 has 36 divisors (see below), whose sum is σ = 217532952. Its totient is φ = 33414400.

The previous prime is 91890697. The next prime is 91890703. The reversal of 91890700 is 709819.

It is an interprime number because it is at equal distance from previous prime (91890697) and next prime (91890703).

It is not an unprimeable number, because it can be changed into a prime (91890703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40669 + ... + 42868.

It is an arithmetic number, because the mean of its divisors is an integer number (6042582).

Almost surely, 2^91890700 is an apocalyptic number.

It is an amenable number.

91890700 is an abundant number, since it is smaller than the sum of its proper divisors (125642252).

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

91890700 is a wasteful number, since it uses less digits than its factorization.

91890700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83562 (or 83555 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 91890700 is about 9585.9636969895. The cubic root of 91890700 is about 451.2568976061.

The spelling of 91890700 in words is "ninety-one million, eight hundred ninety thousand, seven hundred".