661674 has 32 divisors (see below), whose sum is σ = 1512000. Its totient is φ = 191232.

The previous prime is 661673. The next prime is 661679. The reversal of 661674 is 476166.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661673) 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, 1077 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (47250).

2⁶⁶¹⁶⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756000).

661674 is an abundant number, since it is smaller than the sum of its proper divisors (850326).

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

661674 is a wasteful number, since it uses less digits than its factorization.

661674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its digits is 6048, while the sum is 30.

The square root of 661674 is about 813.4334637818. The cubic root of 661674 is about 87.1394250066.

The spelling of 661674 in words is "six hundred sixty-one thousand, six hundred seventy-four".