1375649568 has 120 divisors (see below), whose sum is σ = 4185484380. Its totient is φ = 442713600.

The previous prime is 1375649567. The next prime is 1375649581. The reversal of 1375649568 is 8659465731.

1375649568 is a `hidden beast` number, since 1 + 3 + 75 + 6 + 4 + 9 + 568 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1237069584 + 138579984 = 35172^2 + 11772^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1375649567) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66018 + ... + 84318.

Almost surely, 2^1375649568 is an apocalyptic number.

1375649568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1375649568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2092742190).

1375649568 is an abundant number, since it is smaller than the sum of its proper divisors (2809834812).

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

1375649568 is a wasteful number, since it uses less digits than its factorization.

1375649568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18352 (or 18335 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 1375649568 is about 37089.7501744080. The cubic root of 1375649568 is about 1112.1651239359.

The spelling of 1375649568 in words is "one billion, three hundred seventy-five million, six hundred forty-nine thousand, five hundred sixty-eight".