28742128777857 has 64 divisors (see below), whose sum is σ = 45734390415360. Its totient is φ = 15851868825600.

The previous prime is 28742128777849. The next prime is 28742128777889. The reversal of 28742128777857 is 75877782124782.

It is not a de Polignac number, because 28742128777857 - 2³ = 28742128777849 is a prime.

It is a super-2 number, since 2×28742128777857² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28742128777807) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18902508 + ... + 20366370.

It is an arithmetic number, because the mean of its divisors is an integer number (714599850240).

Almost surely, 2^{28742128777857} is an apocalyptic number.

It is an amenable number.

28742128777857 is a deficient number, since it is larger than the sum of its proper divisors (16992261637503).

28742128777857 is a wasteful number, since it uses less digits than its factorization.

28742128777857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465054.

The product of its digits is 1376829440, while the sum is 75.

The spelling of 28742128777857 in words is "twenty-eight trillion, seven hundred forty-two billion, one hundred twenty-eight million, seven hundred seventy-seven thousand, eight hundred fifty-seven".