6407663 has 4 divisors (see below), whose sum is σ = 6443640. Its totient is φ = 6371688.

The previous prime is 6407591. The next prime is 6407671. The reversal of 6407663 is 3667046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3667046 = 2 ⋅1833523.

It is a cyclic number.

It is not a de Polignac number, because 6407663 - 2¹⁰ = 6406639 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 (6407263) 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, 17720 + ... + 18077.

It is an arithmetic number, because the mean of its divisors is an integer number (1610910).

Almost surely, 2^6407663 is an apocalyptic number.

6407663 is a deficient number, since it is larger than the sum of its proper divisors (35977).

6407663 is a wasteful number, since it uses less digits than its factorization.

6407663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35976.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 6407663 is about 2531.3362084085. The cubic root of 6407663 is about 185.7376248211.

The spelling of 6407663 in words is "six million, four hundred seven thousand, six hundred sixty-three".