91226988 has 36 divisors (see below), whose sum is σ = 233527840. Its totient is φ = 30023136.

The previous prime is 91226969. The next prime is 91227013. The reversal of 91226988 is 88962219.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 13195 + ... + 18882.

Almost surely, 2^91226988 is an apocalyptic number.

It is an amenable number.

91226988 is an abundant number, since it is smaller than the sum of its proper divisors (142300852).

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

91226988 is a wasteful number, since it uses less digits than its factorization.

91226988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32166 (or 32161 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 91226988 is about 9551.2820081914. The cubic root of 91226988 is about 450.1678188889.

It can be divided in two parts, 9122 and 6988, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 91226988 in words is "ninety-one million, two hundred twenty-six thousand, nine hundred eighty-eight".