91232740 has 12 divisors (see below), whose sum is σ = 191588796. Its totient is φ = 36493088.

The previous prime is 91232717. The next prime is 91232741. The reversal of 91232740 is 4723219.

It can be written as a sum of positive squares in 2 ways, for example, as 14915044 + 76317696 = 3862^2 + 8736^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91232699 and 91232708.

It is not an unprimeable number, because it can be changed into a prime (91232741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2280799 + ... + 2280838.

It is an arithmetic number, because the mean of its divisors is an integer number (15965733).

Almost surely, 2^91232740 is an apocalyptic number.

It is an amenable number.

91232740 is an abundant number, since it is smaller than the sum of its proper divisors (100356056).

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

91232740 is a wasteful number, since it uses less digits than its factorization.

91232740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561646 (or 4561644 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 91232740 is about 9551.5831148559. The cubic root of 91232740 is about 450.1772799447.

Adding to 91232740 its reverse (4723219), we get a palindrome (95955959).

The spelling of 91232740 in words is "ninety-one million, two hundred thirty-two thousand, seven hundred forty".