91380040 has 16 divisors (see below), whose sum is σ = 205605180. Its totient is φ = 36552000.

The previous prime is 91380019. The next prime is 91380059. The reversal of 91380040 is 4008319.

It can be written as a sum of positive squares in 2 ways, for example, as 91278916 + 101124 = 9554^2 + 318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91379987 and 91380014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142211 + ... + 1142290.

Almost surely, 2^91380040 is an apocalyptic number.

It is an amenable number.

91380040 is an abundant number, since it is smaller than the sum of its proper divisors (114225140).

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

91380040 is a wasteful number, since it uses less digits than its factorization.

91380040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284512 (or 2284508 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 91380040 is about 9559.2907686711. The cubic root of 91380040 is about 450.4194278758.

Adding to 91380040 its reverse (4008319), we get a palindrome (95388359).

The spelling of 91380040 in words is "ninety-one million, three hundred eighty thousand, forty".