91149720 has 32 divisors (see below), whose sum is σ = 273449520. Its totient is φ = 24306560.

The previous prime is 91149701. The next prime is 91149727. The reversal of 91149720 is 2794119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91149727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379671 + ... + 379910.

Almost surely, 2^91149720 is an apocalyptic number.

It is an amenable number.

91149720 is an abundant number, since it is smaller than the sum of its proper divisors (182299800).

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

91149720 is a wasteful number, since it uses less digits than its factorization.

91149720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759595 (or 759591 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 91149720 is about 9547.2362493027. The cubic root of 91149720 is about 450.0406876791.

The spelling of 91149720 in words is "ninety-one million, one hundred forty-nine thousand, seven hundred twenty".