611978 has 8 divisors (see below), whose sum is σ = 931872. Its totient is φ = 301356.

The previous prime is 611977. The next prime is 611993. The reversal of 611978 is 879116.

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

It is not an unprimeable number, because it can be changed into a prime (611977) 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, 2150 + ... + 2417.

It is an arithmetic number, because the mean of its divisors is an integer number (116484).

2⁶¹¹⁹⁷⁸ is an apocalyptic number.

611978 is a deficient number, since it is larger than the sum of its proper divisors (319894).

611978 is a wasteful number, since it uses less digits than its factorization.

611978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636.

The product of its digits is 3024, while the sum is 32.

The square root of 611978 is about 782.2902274732. The cubic root of 611978 is about 84.9008301332.

The spelling of 611978 in words is "six hundred eleven thousand, nine hundred seventy-eight".