613978 has 8 divisors (see below), whose sum is σ = 945972. Its totient is φ = 298656.

The previous prime is 613969. The next prime is 613981. The reversal of 613978 is 879316.

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 182329 = 657^2 + 427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4075 + ... + 4222.

2⁶¹³⁹⁷⁸ is an apocalyptic number.

613978 is a deficient number, since it is larger than the sum of its proper divisors (331994).

613978 is a wasteful number, since it uses less digits than its factorization.

613978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8336.

The product of its digits is 9072, while the sum is 34.

The square root of 613978 is about 783.5674827352. The cubic root of 613978 is about 84.9932174519.

The spelling of 613978 in words is "six hundred thirteen thousand, nine hundred seventy-eight".