674778 has 32 divisors (see below), whose sum is σ = 1495872. Its totient is φ = 201600.

The previous prime is 674771. The next prime is 674789. The reversal of 674778 is 877476.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (674771) 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 in 15 ways as a sum of consecutive naturals, for example, 3093 + ... + 3303.

It is an arithmetic number, because the mean of its divisors is an integer number (46746).

2⁶⁷⁴⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 674778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747936).

674778 is an abundant number, since it is smaller than the sum of its proper divisors (821094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

674778 is a wasteful number, since it uses less digits than its factorization.

674778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 65856, while the sum is 39.

The square root of 674778 is about 821.4487202498. The cubic root of 674778 is about 87.7109143225.

The spelling of 674778 in words is "six hundred seventy-four thousand, seven hundred seventy-eight".