7821342924780 has 768 divisors, whose sum is σ = 29815382016000. Its totient is φ = 1483055308800.

The previous prime is 7821342924767. The next prime is 7821342924781. The reversal of 7821342924780 is 874292431287.

It is a super-2 number, since 2×7821342924780² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 7821342924780.

It is not an unprimeable number, because it can be changed into a prime (7821342924781) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 284305666 + ... + 284333174.

It is an arithmetic number, because the mean of its divisors is an integer number (38822112000).

Almost surely, 2^{7821342924780} is an apocalyptic number.

7821342924780 is a gapful number since it is divisible by the number (70) 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 7821342924780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14907691008000).

7821342924780 is an abundant number, since it is smaller than the sum of its proper divisors (21994039091220).

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

7821342924780 is a wasteful number, since it uses less digits than its factorization.

7821342924780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27678 (or 27676 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 57.

The spelling of 7821342924780 in words is "seven trillion, eight hundred twenty-one billion, three hundred forty-two million, nine hundred twenty-four thousand, seven hundred eighty".