645121848 has 288 divisors, whose sum is σ = 2110646160. Its totient is φ = 163215360.

The previous prime is 645121823. The next prime is 645121861. The reversal of 645121848 is 848121546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10575738 + ... + 10575798.

Almost surely, 2^645121848 is an apocalyptic number.

645121848 is a gapful number since it is divisible by the number (68) 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 645121848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055323080).

645121848 is an abundant number, since it is smaller than the sum of its proper divisors (1465524312).

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

645121848 is a wasteful number, since it uses less digits than its factorization.

645121848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 113 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 645121848 is about 25399.2489652745. The cubic root of 645121848 is about 864.0666636663.

The spelling of 645121848 in words is "six hundred forty-five million, one hundred twenty-one thousand, eight hundred forty-eight".