663390 has 112 divisors (see below), whose sum is σ = 2203488. Its totient is φ = 139968.

The previous prime is 663371. The next prime is 663407. The reversal of 663390 is 93366.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 51024 + ... + 51036.

It is an arithmetic number, because the mean of its divisors is an integer number (19674).

2⁶⁶³³⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101744).

663390 is an abundant number, since it is smaller than the sum of its proper divisors (1540098).

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

663390 is a wasteful number, since it uses less digits than its factorization.

663390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 663390 is about 814.4875689659. The cubic root of 663390 is about 87.2146897509.

The spelling of 663390 in words is "six hundred sixty-three thousand, three hundred ninety".