638886478778274 has 16 divisors (see below), whose sum is σ = 1277774546368608. Its totient is φ = 212961894790752.

The previous prime is 638886478778269. The next prime is 638886478778279. The reversal of 638886478778274 is 472877874688836.

It is an interprime number because it is at equal distance from previous prime (638886478778269) and next prime (638886478778279).

It is not an unprimeable number, because it can be changed into a prime (638886478778279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60940852 + ... + 70650975.

It is an arithmetic number, because the mean of its divisors is an integer number (79860909148038).

Almost surely, 2^{638886478778274} is an apocalyptic number.

638886478778274 is an abundant number, since it is smaller than the sum of its proper divisors (638888067590334).

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

638886478778274 is a wasteful number, since it uses less digits than its factorization.

638886478778274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132401009.

The product of its digits is 271904145408, while the sum is 93.

The spelling of 638886478778274 in words is "six hundred thirty-eight trillion, eight hundred eighty-six billion, four hundred seventy-eight million, seven hundred seventy-eight thousand, two hundred seventy-four".