7861909228640 has 48 divisors (see below), whose sum is σ = 18598759165728. Its totient is φ = 3140531122176.

The previous prime is 7861909228639. The next prime is 7861909228651. The reversal of 7861909228640 is 468229091687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32947697 + ... + 33185456.

It is an arithmetic number, because the mean of its divisors is an integer number (387474149286).

Almost surely, 2^{7861909228640} is an apocalyptic number.

It is an amenable number.

7861909228640 is an abundant number, since it is smaller than the sum of its proper divisors (10736849937088).

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

7861909228640 is a wasteful number, since it uses less digits than its factorization.

7861909228640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66133911 (or 66133903 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 7861909228640 in words is "seven trillion, eight hundred sixty-one billion, nine hundred nine million, two hundred twenty-eight thousand, six hundred forty".