65678613 has 32 divisors (see below), whose sum is σ = 117583872. Its totient is φ = 31492800.

The previous prime is 65678609. The next prime is 65678617. The reversal of 65678613 is 31687656.

It is an interprime number because it is at equal distance from previous prime (65678609) and next prime (65678617).

It is not a de Polignac number, because 65678613 - 2² = 65678609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65678617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7933 + ... + 13938.

It is an arithmetic number, because the mean of its divisors is an integer number (3674496).

Almost surely, 2^65678613 is an apocalyptic number.

It is an amenable number.

65678613 is a deficient number, since it is larger than the sum of its proper divisors (51905259).

65678613 is a wasteful number, since it uses less digits than its factorization.

65678613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21905.

The product of its digits is 181440, while the sum is 42.

The square root of 65678613 is about 8104.2342636427. The cubic root of 65678613 is about 403.4669738297.

The spelling of 65678613 in words is "sixty-five million, six hundred seventy-eight thousand, six hundred thirteen".