28721685845951 has 12 divisors (see below), whose sum is σ = 34041335788152. Its totient is φ = 24154086207888.

The previous prime is 28721685845939. The next prime is 28721685845969. The reversal of 28721685845951 is 15954858612782.

It is not a de Polignac number, because 28721685845951 - 2¹⁸ = 28721685583807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28721685845551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5529779045 + ... + 5529784238.

It is an arithmetic number, because the mean of its divisors is an integer number (2836777982346).

Almost surely, 2^{28721685845951} is an apocalyptic number.

28721685845951 is a deficient number, since it is larger than the sum of its proper divisors (5319649942201).

28721685845951 is a wasteful number, since it uses less digits than its factorization.

28721685845951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11059563350 (or 11059563343 counting only the distinct ones).

The product of its digits is 387072000, while the sum is 71.

The spelling of 28721685845951 in words is "twenty-eight trillion, seven hundred twenty-one billion, six hundred eighty-five million, eight hundred forty-five thousand, nine hundred fifty-one".