664877 has 4 divisors (see below), whose sum is σ = 669120. Its totient is φ = 660636.

The previous prime is 664849. The next prime is 664879. The reversal of 664877 is 778466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664877 - 2⁸ = 664621 is a prime.

It is a super-2 number, since 2×664877² = 884122850258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664877.

It is a congruent 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, 1877 + ... + 2202.

It is an arithmetic number, because the mean of its divisors is an integer number (167280).

2⁶⁶⁴⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

664877 is a deficient number, since it is larger than the sum of its proper divisors (4243).

664877 is a wasteful number, since it uses less digits than its factorization.

664877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242.

The product of its digits is 56448, while the sum is 38.

The square root of 664877 is about 815.3999018886. The cubic root of 664877 is about 87.2798055273.

The spelling of 664877 in words is "six hundred sixty-four thousand, eight hundred seventy-seven".