645070873200 has 240 divisors, whose sum is σ = 2231547171840. Its totient is φ = 158342999040.

The previous prime is 645070873193. The next prime is 645070873297. The reversal of 645070873200 is 2378070546.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×645070873200² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5542809 + ... + 5657991.

It is an arithmetic number, because the mean of its divisors is an integer number (9298113216).

Almost surely, 2^645070873200 is an apocalyptic number.

645070873200 is a gapful number since it is divisible by the number (60) 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 645070873200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115773585920).

645070873200 is an abundant number, since it is smaller than the sum of its proper divisors (1586476298640).

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

645070873200 is a wasteful number, since it uses less digits than its factorization.

645070873200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115576 (or 115565 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 645070873200 in words is "six hundred forty-five billion, seventy million, eight hundred seventy-three thousand, two hundred".