91898920 has 16 divisors (see below), whose sum is σ = 206772660. Its totient is φ = 36759552.

The previous prime is 91898903. The next prime is 91898927. The reversal of 91898920 is 2989819.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 87497316 + 4401604 = 9354^2 + 2098^2 .

It is a super-2 number, since 2×91898920² = 16890822994332800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91898927) 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 3 ways as a sum of consecutive naturals, for example, 1148697 + ... + 1148776.

Almost surely, 2^91898920 is an apocalyptic number.

It is an amenable number.

91898920 is an abundant number, since it is smaller than the sum of its proper divisors (114873740).

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

91898920 is a wasteful number, since it uses less digits than its factorization.

91898920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297484 (or 2297480 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 91898920 is about 9586.3924392860. The cubic root of 91898920 is about 451.2703527983.

The spelling of 91898920 in words is "ninety-one million, eight hundred ninety-eight thousand, nine hundred twenty".