646074 has 48 divisors (see below), whose sum is σ = 1651104. Its totient is φ = 180000.

The previous prime is 646073. The next prime is 646099. The reversal of 646074 is 470646.

It is a super-2 number, since 2×646074² = 834823226952, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2449 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2⁶⁴⁶⁰⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825552).

646074 is an abundant number, since it is smaller than the sum of its proper divisors (1005030).

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

646074 is a wasteful number, since it uses less digits than its factorization.

646074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 646074 is about 803.7872852938. The cubic root of 646074 is about 86.4491554136.

The spelling of 646074 in words is "six hundred forty-six thousand, seventy-four".