65489820 has 96 divisors (see below), whose sum is σ = 203164416. Its totient is φ = 15628800.

The previous prime is 65489819. The next prime is 65489839. The reversal of 65489820 is 2898456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43480 + ... + 44960.

It is an arithmetic number, because the mean of its divisors is an integer number (2116296).

Almost surely, 2^65489820 is an apocalyptic number.

65489820 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 65489820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101582208).

65489820 is an abundant number, since it is smaller than the sum of its proper divisors (137674596).

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

65489820 is a wasteful number, since it uses less digits than its factorization.

65489820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 65489820 is about 8092.5780811803. The cubic root of 65489820 is about 403.0800145704.

The spelling of 65489820 in words is "sixty-five million, four hundred eighty-nine thousand, eight hundred twenty".