638297088 has 176 divisors, whose sum is σ = 2000099136. Its totient is φ = 178421760.

The previous prime is 638297069. The next prime is 638297237. The reversal of 638297088 is 880792836.

It is a tau number, because it is divible by the number of its divisors (176).

It is a self number, because there is not a number n which added to its sum of digits gives 638297088.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438570 + ... + 440022.

Almost surely, 2^638297088 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 638297088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000049568).

638297088 is an abundant number, since it is smaller than the sum of its proper divisors (1361802048).

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

638297088 is a wasteful number, since it uses less digits than its factorization.

638297088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 638297088 is about 25264.5421094466. The cubic root of 638297088 is about 861.0088611174.

The spelling of 638297088 in words is "six hundred thirty-eight million, two hundred ninety-seven thousand, eighty-eight".