7791689940 has 24 divisors (see below), whose sum is σ = 21816732000. Its totient is φ = 2077783968.

The previous prime is 7791689923. The next prime is 7791689953. The reversal of 7791689940 is 499861977.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 129861499 = 7791689940 / (7 + 7 + 9 + 1 + 6 + 8 + 9 + 9 + 4 + 0).

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, 64930690 + ... + 64930809.

It is an arithmetic number, because the mean of its divisors is an integer number (909030500).

Almost surely, 2^7791689940 is an apocalyptic number.

It is an amenable number.

7791689940 is an abundant number, since it is smaller than the sum of its proper divisors (14025042060).

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

7791689940 is a wasteful number, since it uses less digits than its factorization.

7791689940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129861511 (or 129861509 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 60.

The square root of 7791689940 is about 88270.5496754155. The cubic root of 7791689940 is about 1982.4879397447.

The spelling of 7791689940 in words is "seven billion, seven hundred ninety-one million, six hundred eighty-nine thousand, nine hundred forty".