1375745644 has 96 divisors (see below), whose sum is σ = 3124509696. Its totient is φ = 515116800.

The previous prime is 1375745641. The next prime is 1375745669. The reversal of 1375745644 is 4465475731.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 1375745594 and 1375745603.

It is not an unprimeable number, because it can be changed into a prime (1375745641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 844759 + ... + 846385.

It is an arithmetic number, because the mean of its divisors is an integer number (32546976).

Almost surely, 2^1375745644 is an apocalyptic number.

1375745644 is a gapful number since it is divisible by the number (14) 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 1375745644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562254848).

1375745644 is an abundant number, since it is smaller than the sum of its proper divisors (1748764052).

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

1375745644 is a wasteful number, since it uses less digits than its factorization.

1375745644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1773 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 46.

The square root of 1375745644 is about 37091.0453344200. The cubic root of 1375745644 is about 1112.1910147081.

The spelling of 1375745644 in words is "one billion, three hundred seventy-five million, seven hundred forty-five thousand, six hundred forty-four".