1375747644 has 48 divisors (see below), whose sum is σ = 3403185408. Its totient is φ = 431063808.

The previous prime is 1375747609. The next prime is 1375747657. The reversal of 1375747644 is 4467475731.

It is a junction number, because it is equal to n+sod(n) for n = 1375747593 and 1375747602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177147 + ... + 184749.

It is an arithmetic number, because the mean of its divisors is an integer number (70899696).

Almost surely, 2^1375747644 is an apocalyptic number.

It is an amenable number.

1375747644 is an abundant number, since it is smaller than the sum of its proper divisors (2027437764).

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

1375747644 is a wasteful number, since it uses less digits than its factorization.

1375747644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8514 (or 8512 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 48.

The square root of 1375747644 is about 37091.0722950955. The cubic root of 1375747644 is about 1112.1915536597.

The spelling of 1375747644 in words is "one billion, three hundred seventy-five million, seven hundred forty-seven thousand, six hundred forty-four".