65617540 has 12 divisors (see below), whose sum is σ = 137796876. Its totient is φ = 26247008.

The previous prime is 65617537. The next prime is 65617543. The reversal of 65617540 is 4571656.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65617537) and next prime (65617543).

It can be written as a sum of positive squares in 2 ways, for example, as 51494976 + 14122564 = 7176^2 + 3758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65617496 and 65617505.

It is not an unprimeable number, because it can be changed into a prime (65617543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640419 + ... + 1640458.

It is an arithmetic number, because the mean of its divisors is an integer number (11483073).

Almost surely, 2^65617540 is an apocalyptic number.

It is an amenable number.

65617540 is an abundant number, since it is smaller than the sum of its proper divisors (72179336).

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

65617540 is a wasteful number, since it uses less digits than its factorization.

65617540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280886 (or 3280884 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 65617540 is about 8100.4654187275. The cubic root of 65617540 is about 403.3418768918.

The spelling of 65617540 in words is "sixty-five million, six hundred seventeen thousand, five hundred forty".