7649717787920 has 80 divisors (see below), whose sum is σ = 20161806853440. Its totient is φ = 2675852692992.

The previous prime is 7649717787889. The next prime is 7649717787967. The reversal of 7649717787920 is 297877179467.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193545974 + ... + 193585493.

It is an arithmetic number, because the mean of its divisors is an integer number (252022585668).

Almost surely, 2^{7649717787920} is an apocalyptic number.

It is an amenable number.

7649717787920 is an abundant number, since it is smaller than the sum of its proper divisors (12512089065520).

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

7649717787920 is a wasteful number, since it uses less digits than its factorization.

7649717787920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387131512 (or 387131506 counting only the distinct ones).

The product of its (nonzero) digits is 522764928, while the sum is 74.

The spelling of 7649717787920 in words is "seven trillion, six hundred forty-nine billion, seven hundred seventeen million, seven hundred eighty-seven thousand, nine hundred twenty".