65159640 has 480 divisors, whose sum is σ = 286973280. Its totient is φ = 12939264.

The previous prime is 65159639. The next prime is 65159687. The reversal of 65159640 is 4695156.

65159640 is a `hidden beast` number, since 6 + 5 + 1 + 5 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65159595 and 65159604.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 507 × 357 × 360.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3832912 + ... + 3832928.

It is an arithmetic number, because the mean of its divisors is an integer number (597861).

Almost surely, 2^65159640 is an apocalyptic number.

65159640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65159640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143486640).

65159640 is an abundant number, since it is smaller than the sum of its proper divisors (221813640).

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

65159640 is a wasteful number, since it uses less digits than its factorization.

65159640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 65159640 is about 8072.1521293890. The cubic root of 65159640 is about 402.4014701663.

The spelling of 65159640 in words is "sixty-five million, one hundred fifty-nine thousand, six hundred forty".