1338558660 has 72 divisors (see below), whose sum is σ = 4115955480. Its totient is φ = 352055808.

The previous prime is 1338558659. The next prime is 1338558673. The reversal of 1338558660 is 668558331.

1338558660 is a `hidden beast` number, since 1 + 3 + 3 + 8 + 5 + 586 + 60 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 61496964 + 1277061696 = 7842^2 + 35736^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37795 + ... + 64074.

Almost surely, 2^1338558660 is an apocalyptic number.

1338558660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338558660 is an abundant number, since it is smaller than the sum of its proper divisors (2777396820).

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

1338558660 is a wasteful number, since it uses less digits than its factorization.

1338558660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101957 (or 101952 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1338558660 is about 36586.3179344410. The cubic root of 1338558660 is about 1102.0783461701.

The spelling of 1338558660 in words is "one billion, three hundred thirty-eight million, five hundred fifty-eight thousand, six hundred sixty".