612778 has 4 divisors (see below), whose sum is σ = 919170. Its totient is φ = 306388.

The previous prime is 612763. The next prime is 612791. The reversal of 612778 is 877216.

It is a happy number.

612778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 458329 + 154449 = 677^2 + 393^2 .

It is a Smith number, since the sum of its digits (31) 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.

612778 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, 153193 + ... + 153196.

2⁶¹²⁷⁷⁸ is an apocalyptic number.

612778 is a deficient number, since it is larger than the sum of its proper divisors (306392).

612778 is a wasteful number, since it uses less digits than its factorization.

612778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306391.

The product of its digits is 4704, while the sum is 31.

The square root of 612778 is about 782.8013796615. The cubic root of 612778 is about 84.9378091800.

The spelling of 612778 in words is "six hundred twelve thousand, seven hundred seventy-eight".