91069990 has 32 divisors (see below), whose sum is σ = 179283456. Its totient is φ = 33032160.

The previous prime is 91069963. The next prime is 91069991. The reversal of 91069990 is 9996019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91069991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56739 + ... + 58321.

It is an arithmetic number, because the mean of its divisors is an integer number (5602608).

Almost surely, 2^91069990 is an apocalyptic number.

91069990 is a deficient number, since it is larger than the sum of its proper divisors (88213466).

91069990 is a wasteful number, since it uses less digits than its factorization.

91069990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 91069990 is about 9543.0597818519. The cubic root of 91069990 is about 449.9094303323.

The spelling of 91069990 in words is "ninety-one million, sixty-nine thousand, nine hundred ninety".