65404140 has 48 divisors (see below), whose sum is σ = 184369920. Its totient is φ = 17323200.

The previous prime is 65404133. The next prime is 65404153. The reversal of 65404140 is 4140456.

It is a self number, because there is not a number n which added to its sum of digits gives 65404140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5451 + ... + 12669.

It is an arithmetic number, because the mean of its divisors is an integer number (3841040).

Almost surely, 2^65404140 is an apocalyptic number.

65404140 is a gapful number since it is divisible by the number (60) 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 65404140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92184960).

65404140 is an abundant number, since it is smaller than the sum of its proper divisors (118965780).

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

65404140 is a wasteful number, since it uses less digits than its factorization.

65404140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382 (or 7380 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 65404140 is about 8087.2826091339. The cubic root of 65404140 is about 402.9041553419.

Adding to 65404140 its reverse (4140456), we get a palindrome (69544596).

The spelling of 65404140 in words is "sixty-five million, four hundred four thousand, one hundred forty".