1291928075788 has 24 divisors (see below), whose sum is σ = 2735847690912. Its totient is φ = 521113845504.

The previous prime is 1291928075719. The next prime is 1291928075791. The reversal of 1291928075788 is 8875708291921.

It is a happy 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, 1357066831 + ... + 1357067782.

It is an arithmetic number, because the mean of its divisors is an integer number (113993653788).

Almost surely, 2^{1291928075788} is an apocalyptic number.

It is an amenable number.

1291928075788 is an abundant number, since it is smaller than the sum of its proper divisors (1443919615124).

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

1291928075788 is a wasteful number, since it uses less digits than its factorization.

1291928075788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714134641 (or 2714134639 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 67.

The spelling of 1291928075788 in words is "one trillion, two hundred ninety-one billion, nine hundred twenty-eight million, seventy-five thousand, seven hundred eighty-eight".