40691560 has 96 divisors (see below), whose sum is σ = 114768360. Its totient is φ = 12870144.

The previous prime is 40691549. The next prime is 40691569. The reversal of 40691560 is 6519604.

It can be written as a sum of positive squares in 4 ways, for example, as 18957316 + 21734244 = 4354^2 + 4662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40691569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24682 + ... + 26278.

Almost surely, 2^40691560 is an apocalyptic number.

40691560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40691560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57384180).

40691560 is an abundant number, since it is smaller than the sum of its proper divisors (74076800).

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

40691560 is a wasteful number, since it uses less digits than its factorization.

40691560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 40691560 is about 6378.9936510393. The cubic root of 40691560 is about 343.9548570652.

The spelling of 40691560 in words is "forty million, six hundred ninety-one thousand, five hundred sixty".