1125646464 has 64 divisors (see below), whose sum is σ = 3011652000. Its totient is φ = 372498432.

The previous prime is 1125646453. The next prime is 1125646477. The reversal of 1125646464 is 4646465211.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42832 + ... + 63920.

Almost surely, 2^1125646464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1125646464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505826000).

1125646464 is an abundant number, since it is smaller than the sum of its proper divisors (1886005536).

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

1125646464 is a wasteful number, since it uses less digits than its factorization.

1125646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21245 (or 21233 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 1125646464 is about 33550.6551947946. The cubic root of 1125646464 is about 1040.2410880920.

The spelling of 1125646464 in words is "one billion, one hundred twenty-five million, six hundred forty-six thousand, four hundred sixty-four".