663934206 has 64 divisors (see below), whose sum is σ = 1465744896. Its totient is φ = 199248000.

The previous prime is 663934177. The next prime is 663934211. The reversal of 663934206 is 602439366.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558745 + ... + 559931.

It is an arithmetic number, because the mean of its divisors is an integer number (22902264).

Almost surely, 2^663934206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663934206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732872448).

663934206 is an abundant number, since it is smaller than the sum of its proper divisors (801810690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663934206 is a wasteful number, since it uses less digits than its factorization.

663934206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 663934206 is about 25766.9207706315. The cubic root of 663934206 is about 872.3853182711.

The spelling of 663934206 in words is "six hundred sixty-three million, nine hundred thirty-four thousand, two hundred six".