65257040 has 20 divisors (see below), whose sum is σ = 151722804. Its totient is φ = 26102784.

The previous prime is 65257037. The next prime is 65257051. The reversal of 65257040 is 4075256.

It can be written as a sum of positive squares in 2 ways, for example, as 25969216 + 39287824 = 5096^2 + 6268^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 65256994 and 65257012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407777 + ... + 407936.

Almost surely, 2^65257040 is an apocalyptic number.

It is an amenable number.

65257040 is an abundant number, since it is smaller than the sum of its proper divisors (86465764).

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

65257040 is a wasteful number, since it uses less digits than its factorization.

65257040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815726 (or 815720 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 65257040 is about 8078.1829640087. The cubic root of 65257040 is about 402.6018722890.

The spelling of 65257040 in words is "sixty-five million, two hundred fifty-seven thousand, forty".