638274476 has 48 divisors (see below), whose sum is σ = 1325248512. Its totient is φ = 263304000.

The previous prime is 638274463. The next prime is 638274487. The reversal of 638274476 is 674472836.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 638274476.

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, 76301 + ... + 84251.

It is an arithmetic number, because the mean of its divisors is an integer number (27609344).

Almost surely, 2^638274476 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 638274476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662624256).

638274476 is an abundant number, since it is smaller than the sum of its proper divisors (686974036).

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

638274476 is a wasteful number, since it uses less digits than its factorization.

638274476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070 (or 8068 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 47.

The square root of 638274476 is about 25264.0946008362. The cubic root of 638274476 is about 860.9986937713.

The spelling of 638274476 in words is "six hundred thirty-eight million, two hundred seventy-four thousand, four hundred seventy-six".