613864 has 8 divisors (see below), whose sum is σ = 1151010. Its totient is φ = 306928.

The previous prime is 613861. The next prime is 613883. The reversal of 613864 is 468316.

It can be written as a sum of positive squares in only one way, i.e., 311364 + 302500 = 558^2 + 550^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (613861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38359 + ... + 38374.

2⁶¹³⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

613864 is a deficient number, since it is larger than the sum of its proper divisors (537146).

613864 is a wasteful number, since it uses less digits than its factorization.

613864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76739 (or 76735 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 613864 is about 783.4947351450. The cubic root of 613864 is about 84.9879567712.

The spelling of 613864 in words is "six hundred thirteen thousand, eight hundred sixty-four".