65039940 has 144 divisors (see below), whose sum is σ = 231154560. Its totient is φ = 14492160.

The previous prime is 65039939. The next prime is 65039959. The reversal of 65039940 is 4993056.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65039895 and 65039904.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51031 + ... + 52289.

It is an arithmetic number, because the mean of its divisors is an integer number (1605240).

Almost surely, 2^65039940 is an apocalyptic number.

65039940 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 65039940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115577280).

65039940 is an abundant number, since it is smaller than the sum of its proper divisors (166114620).

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

65039940 is a wasteful number, since it uses less digits than its factorization.

65039940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 65039940 is about 8064.7343415639. The cubic root of 65039940 is about 402.1549117083.

The spelling of 65039940 in words is "sixty-five million, thirty-nine thousand, nine hundred forty".