65717640 has 48 divisors (see below), whose sum is σ = 213583500. Its totient is φ = 17524608.

The previous prime is 65717627. The next prime is 65717653. The reversal of 65717640 is 4671756.

65717640 is a `hidden beast` number, since 6 + 5 + 7 + 1 + 7 + 640 = 666.

65717640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (65717627) and next prime (65717653).

It can be written as a sum of positive squares in 2 ways, for example, as 65707236 + 10404 = 8106^2 + 102^2 .

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 = 65717595 and 65717604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90915 + ... + 91634.

Almost surely, 2^65717640 is an apocalyptic number.

65717640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65717640 is an abundant number, since it is smaller than the sum of its proper divisors (147865860).

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

65717640 is a wasteful number, since it uses less digits than its factorization.

65717640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182566 (or 182559 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 65717640 is about 8106.6417214528. The cubic root of 65717640 is about 403.5468729377.

The spelling of 65717640 in words is "sixty-five million, seven hundred seventeen thousand, six hundred forty".