91930240 has 48 divisors (see below), whose sum is σ = 220352130. Its totient is φ = 36675072.

The previous prime is 91930211. The next prime is 91930243. The reversal of 91930240 is 4203919.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 82737216 + 9193024 = 9096^2 + 3032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91930199 and 91930208.

It is not an unprimeable number, because it can be changed into a prime (91930243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 242371 + ... + 242749.

Almost surely, 2^91930240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91930240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110176065).

91930240 is an abundant number, since it is smaller than the sum of its proper divisors (128421890).

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

91930240 is an frugal number, since it uses more digits than its factorization.

91930240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91930240 is about 9588.0258656305. The cubic root of 91930240 is about 451.3216126757.

The spelling of 91930240 in words is "ninety-one million, nine hundred thirty thousand, two hundred forty".