613642 has 4 divisors (see below), whose sum is σ = 920466. Its totient is φ = 306820.

The previous prime is 613637. The next prime is 613651. The reversal of 613642 is 246316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 477481 + 136161 = 691^2 + 369^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

613642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153409 + ... + 153412.

2⁶¹³⁶⁴² is an apocalyptic number.

613642 is a deficient number, since it is larger than the sum of its proper divisors (306824).

613642 is a wasteful number, since it uses less digits than its factorization.

613642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306823.

The product of its digits is 864, while the sum is 22.

The square root of 613642 is about 783.3530493973. The cubic root of 613642 is about 84.9777104185.

Adding to 613642 its reverse (246316), we get a palindrome (859958).

The spelling of 613642 in words is "six hundred thirteen thousand, six hundred forty-two".