65580990 has 32 divisors (see below), whose sum is σ = 157675680. Its totient is φ = 17457024.

The previous prime is 65580979. The next prime is 65580997. The reversal of 65580990 is 9908556.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65580997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18696 + ... + 21924.

It is an arithmetic number, because the mean of its divisors is an integer number (4927365).

Almost surely, 2^65580990 is an apocalyptic number.

65580990 is an abundant number, since it is smaller than the sum of its proper divisors (92094690).

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

65580990 is a wasteful number, since it uses less digits than its factorization.

65580990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 65580990 is about 8098.2090612678. The cubic root of 65580990 is about 403.2669737300.

The spelling of 65580990 in words is "sixty-five million, five hundred eighty thousand, nine hundred ninety".