65032440 has 128 divisors (see below), whose sum is σ = 224121600. Its totient is φ = 14929920.

The previous prime is 65032439. The next prime is 65032441. The reversal of 65032440 is 4423056.

It is an interprime number because it is at equal distance from previous prime (65032439) and next prime (65032441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65032440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65032441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23784 + ... + 26376.

It is an arithmetic number, because the mean of its divisors is an integer number (1750950).

Almost surely, 2^65032440 is an apocalyptic number.

65032440 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 65032440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112060800).

65032440 is an abundant number, since it is smaller than the sum of its proper divisors (159089160).

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

65032440 is a wasteful number, since it uses less digits than its factorization.

65032440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 65032440 is about 8064.2693407401. The cubic root of 65032440 is about 402.1394531158.

Adding to 65032440 its reverse (4423056), we get a palindrome (69455496).

The spelling of 65032440 in words is "sixty-five million, thirty-two thousand, four hundred forty".