646474 has 8 divisors (see below), whose sum is σ = 1001088. Its totient is φ = 312780.

The previous prime is 646453. The next prime is 646519. The reversal of 646474 is 474646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5152 + ... + 5275.

It is an arithmetic number, because the mean of its divisors is an integer number (125136).

2⁶⁴⁶⁴⁷⁴ is an apocalyptic number.

646474 is a deficient number, since it is larger than the sum of its proper divisors (354614).

646474 is a wasteful number, since it uses less digits than its factorization.

646474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10460.

The product of its digits is 16128, while the sum is 31.

The square root of 646474 is about 804.0360688427. The cubic root of 646474 is about 86.4669926521.

The spelling of 646474 in words is "six hundred forty-six thousand, four hundred seventy-four".