65604040 has 32 divisors (see below), whose sum is σ = 147889080. Its totient is φ = 26191872.

The previous prime is 65604031. The next prime is 65604041. The reversal of 65604040 is 4040656.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60559524 + 5044516 = 7782^2 + 2246^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65603996 and 65604014.

It is not an unprimeable number, because it can be changed into a prime (65604041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25702 + ... + 28138.

Almost surely, 2^65604040 is an apocalyptic number.

It is an amenable number.

65604040 is an abundant number, since it is smaller than the sum of its proper divisors (82285040).

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

65604040 is a wasteful number, since it uses less digits than its factorization.

65604040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3117 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 65604040 is about 8099.6320904100. The cubic root of 65604040 is about 403.3142141215.

Adding to 65604040 its reverse (4040656), we get a palindrome (69644696).

The spelling of 65604040 in words is "sixty-five million, six hundred four thousand, forty".