65521944 has 96 divisors (see below), whose sum is σ = 189540000. Its totient is φ = 20376576.

The previous prime is 65521921. The next prime is 65521999. The reversal of 65521944 is 44912556.

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 = 65521899 and 65521908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243442 + ... + 243710.

It is an arithmetic number, because the mean of its divisors is an integer number (1974375).

Almost surely, 2^65521944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65521944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94770000).

65521944 is an abundant number, since it is smaller than the sum of its proper divisors (124018056).

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

65521944 is a wasteful number, since it uses less digits than its factorization.

65521944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 490 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 65521944 is about 8094.5626194378. The cubic root of 65521944 is about 403.1459099304.

The spelling of 65521944 in words is "sixty-five million, five hundred twenty-one thousand, nine hundred forty-four".