674781 has 16 divisors (see below), whose sum is σ = 969408. Its totient is φ = 416000.

The previous prime is 674771. The next prime is 674789. The reversal of 674781 is 187476.

It is a cyclic number.

It is not a de Polignac number, because 674781 - 2⁵ = 674749 is a prime.

It is a super-2 number, since 2×674781² = 910658795922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

674781 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 674781.

It is not an unprimeable number, because it can be changed into a prime (674789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5086 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (60588).

2⁶⁷⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

674781 is a deficient number, since it is larger than the sum of its proper divisors (294627).

674781 is a wasteful number, since it uses less digits than its factorization.

674781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its digits is 9408, while the sum is 33.

The square root of 674781 is about 821.4505462899. The cubic root of 674781 is about 87.7110443071.

The spelling of 674781 in words is "six hundred seventy-four thousand, seven hundred eighty-one".