212644787520 has 224 divisors, whose sum is σ = 761922702720. Its totient is φ = 49772584960.

The previous prime is 212644787513. The next prime is 212644787647. The reversal of 212644787520 is 25787446212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 212644787520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40947 + ... + 653426.

Almost surely, 2^212644787520 is an apocalyptic number.

212644787520 is a gapful number since it is divisible by the number (20) 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 212644787520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380961351360).

212644787520 is an abundant number, since it is smaller than the sum of its proper divisors (549277915200).

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

212644787520 is a wasteful number, since it uses less digits than its factorization.

212644787520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694433 (or 694423 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 48.

The spelling of 212644787520 in words is "two hundred twelve billion, six hundred forty-four million, seven hundred eighty-seven thousand, five hundred twenty".