1645125888 has 144 divisors (see below), whose sum is σ = 5054206976. Its totient is φ = 465315840.

The previous prime is 1645125871. The next prime is 1645125947. The reversal of 1645125888 is 8885215461.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 552243 + ... + 555213.

Almost surely, 2^1645125888 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 1645125888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527103488).

1645125888 is an abundant number, since it is smaller than the sum of its proper divisors (3409081088).

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

1645125888 is a wasteful number, since it uses less digits than its factorization.

1645125888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100 (or 3086 counting only the distinct ones).

The product of its digits is 614400, while the sum is 48.

The square root of 1645125888 is about 40560.1514790071. The cubic root of 1645125888 is about 1180.5010531318.

The spelling of 1645125888 in words is "one billion, six hundred forty-five million, one hundred twenty-five thousand, eight hundred eighty-eight".