7981204644 has 96 divisors (see below), whose sum is σ = 23767296000. Its totient is φ = 2268842400.

The previous prime is 7981204639. The next prime is 7981204667. The reversal of 7981204644 is 4464021897.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 7981204644.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123919 + ... + 176969.

It is an arithmetic number, because the mean of its divisors is an integer number (247576000).

Almost surely, 2^7981204644 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 7981204644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11883648000).

7981204644 is an abundant number, since it is smaller than the sum of its proper divisors (15786091356).

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

7981204644 is a wasteful number, since it uses less digits than its factorization.

7981204644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53270 (or 53262 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 7981204644 is about 89337.5880802700. The cubic root of 7981204644 is about 1998.4324921138.

The spelling of 7981204644 in words is "seven billion, nine hundred eighty-one million, two hundred four thousand, six hundred forty-four".