638299480 has 288 divisors, whose sum is σ = 1892600640. Its totient is φ = 192890880.

The previous prime is 638299421. The next prime is 638299481. The reversal of 638299480 is 84992836.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638299481) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13580817 + ... + 13580863.

It is an arithmetic number, because the mean of its divisors is an integer number (6571530).

Almost surely, 2^638299480 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 638299480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946300320).

638299480 is an abundant number, since it is smaller than the sum of its proper divisors (1254301160).

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

638299480 is a wasteful number, since it uses less digits than its factorization.

638299480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 638299480 is about 25264.5894484751. The cubic root of 638299480 is about 861.0099366514.

The spelling of 638299480 in words is "six hundred thirty-eight million, two hundred ninety-nine thousand, four hundred eighty".