65505620 has 24 divisors (see below), whose sum is σ = 138162024. Its totient is φ = 26087936.

The previous prime is 65505589. The next prime is 65505647. The reversal of 65505620 is 2650556.

It can be written as a sum of positive squares in 4 ways, for example, as 1281424 + 64224196 = 1132^2 + 8014^2 .

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, 2369 + ... + 11688.

It is an arithmetic number, because the mean of its divisors is an integer number (5756751).

Almost surely, 2^65505620 is an apocalyptic number.

It is an amenable number.

65505620 is an abundant number, since it is smaller than the sum of its proper divisors (72656404).

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

65505620 is a wasteful number, since it uses less digits than its factorization.

65505620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14299 (or 14297 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 65505620 is about 8093.5542254315. The cubic root of 65505620 is about 403.1124275069.

The spelling of 65505620 in words is "sixty-five million, five hundred five thousand, six hundred twenty".