663922840 has 128 divisors (see below), whose sum is σ = 1765048320. Its totient is φ = 220032000.

The previous prime is 663922837. The next prime is 663922867. The reversal of 663922840 is 48229366.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 663922793 and 663922802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1733289 + ... + 1733671.

It is an arithmetic number, because the mean of its divisors is an integer number (13789440).

Almost surely, 2^663922840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663922840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882524160).

663922840 is an abundant number, since it is smaller than the sum of its proper divisors (1101125480).

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

663922840 is a wasteful number, since it uses less digits than its factorization.

663922840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 663922840 is about 25766.7002155883. The cubic root of 663922840 is about 872.3803400730.

The spelling of 663922840 in words is "six hundred sixty-three million, nine hundred twenty-two thousand, eight hundred forty".