663767 has 4 divisors (see below), whose sum is σ = 714840. Its totient is φ = 612696.

The previous prime is 663763. The next prime is 663787. The reversal of 663767 is 767366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 767366 = 2 ⋅383683.

It is a cyclic number.

It is not a de Polignac number, because 663767 - 2² = 663763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663763) 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, 25517 + ... + 25542.

It is an arithmetic number, because the mean of its divisors is an integer number (178710).

2⁶⁶³⁷⁶⁷ is an apocalyptic number.

663767 is a deficient number, since it is larger than the sum of its proper divisors (51073).

663767 is a wasteful number, since it uses less digits than its factorization.

663767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51072.

The product of its digits is 31752, while the sum is 35.

The square root of 663767 is about 814.7189699522. The cubic root of 663767 is about 87.2312077928.

The spelling of 663767 in words is "six hundred sixty-three thousand, seven hundred sixty-seven".