65501840 has 40 divisors (see below), whose sum is σ = 156414840. Its totient is φ = 25491456.

The previous prime is 65501819. The next prime is 65501881. The reversal of 65501840 is 4810556.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36385024 + 29116816 = 6032^2 + 5396^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8105 + ... + 14024.

It is an arithmetic number, because the mean of its divisors is an integer number (3910371).

Almost surely, 2^65501840 is an apocalyptic number.

It is an amenable number.

65501840 is an abundant number, since it is smaller than the sum of its proper divisors (90913000).

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

65501840 is a wasteful number, since it uses less digits than its factorization.

65501840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22179 (or 22173 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 65501840 is about 8093.3207029006. The cubic root of 65501840 is about 403.1046734939.

The spelling of 65501840 in words is "sixty-five million, five hundred one thousand, eight hundred forty".