1336638672 has 50 divisors (see below), whose sum is σ = 3868623858. Its totient is φ = 445545792.

The previous prime is 1336638671. The next prime is 1336638701. The reversal of 1336638672 is 2768366331.

1336638672 is a `hidden beast` number, since 1 + 3 + 3 + 6 + 638 + 6 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1311598656 + 25040016 = 36216^2 + 5004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1336638671) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 514383 + ... + 516974.

Almost surely, 2^1336638672 is an apocalyptic number.

1336638672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1336638672 is an abundant number, since it is smaller than the sum of its proper divisors (2531985186).

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

1336638672 is a wasteful number, since it uses less digits than its factorization.

1336638672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031377 (or 1031362 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 1336638672 is about 36560.0693653609. The cubic root of 1336638672 is about 1101.5511647652.

The spelling of 1336638672 in words is "one billion, three hundred thirty-six million, six hundred thirty-eight thousand, six hundred seventy-two".