91740988 has 24 divisors (see below), whose sum is σ = 164046960. Its totient is φ = 44878080.

The previous prime is 91740983. The next prime is 91740989. The reversal of 91740988 is 88904719.

It is a happy number.

It is a super-2 number, since 2×91740988² = 16832817758432288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91740983) 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, 56070 + ... + 57682.

It is an arithmetic number, because the mean of its divisors is an integer number (6835290).

Almost surely, 2^91740988 is an apocalyptic number.

It is an amenable number.

91740988 is a deficient number, since it is larger than the sum of its proper divisors (72305972).

91740988 is a wasteful number, since it uses less digits than its factorization.

91740988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 91740988 is about 9578.1515962110. The cubic root of 91740988 is about 451.0116958044.

It can be divided in two parts, 917 and 40988, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 91740988 in words is "ninety-one million, seven hundred forty thousand, nine hundred eighty-eight".