663257620 has 12 divisors (see below), whose sum is σ = 1392841044. Its totient is φ = 265303040.

The previous prime is 663257603. The next prime is 663257641. The reversal of 663257620 is 26752366.

It can be written as a sum of positive squares in 2 ways, for example, as 225360144 + 437897476 = 15012^2 + 20926^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 663257620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16581421 + ... + 16581460.

It is an arithmetic number, because the mean of its divisors is an integer number (116070087).

Almost surely, 2^663257620 is an apocalyptic number.

It is an amenable number.

663257620 is an abundant number, since it is smaller than the sum of its proper divisors (729583424).

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

663257620 is a wasteful number, since it uses less digits than its factorization.

663257620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33162890 (or 33162888 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 663257620 is about 25753.7884591763. The cubic root of 663257620 is about 872.0888811150.

The spelling of 663257620 in words is "six hundred sixty-three million, two hundred fifty-seven thousand, six hundred twenty".