664874 has 8 divisors (see below), whose sum is σ = 1139808. Its totient is φ = 284940.

The previous prime is 664849. The next prime is 664879. The reversal of 664874 is 478466.

664874 is nontrivially palindromic in base 16.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (664879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23732 + ... + 23759.

It is an arithmetic number, because the mean of its divisors is an integer number (142476).

2⁶⁶⁴⁸⁷⁴ is an apocalyptic number.

664874 is a deficient number, since it is larger than the sum of its proper divisors (474934).

664874 is a wasteful number, since it uses less digits than its factorization.

664874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47500.

The product of its digits is 32256, while the sum is 35.

The square root of 664874 is about 815.3980622984. The cubic root of 664874 is about 87.2796742550.

The spelling of 664874 in words is "six hundred sixty-four thousand, eight hundred seventy-four".