28947975446655 has 128 divisors (see below), whose sum is σ = 52405125120000. Its totient is φ = 15158722610304.

The previous prime is 28947975446629. The next prime is 28947975446659. The reversal of 28947975446655 is 55664457974982.

28947975446655 is a `hidden beast` number, since 2 + 8 + 9 + 4 + 7 + 9 + 7 + 544 + 6 + 65 + 5 = 666.

It is not a de Polignac number, because 28947975446655 - 2⁶ = 28947975446591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947975446659) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1402575826 + ... + 1402596464.

It is an arithmetic number, because the mean of its divisors is an integer number (409415040000).

Almost surely, 2^{28947975446655} is an apocalyptic number.

28947975446655 is a deficient number, since it is larger than the sum of its proper divisors (23457149673345).

28947975446655 is a wasteful number, since it uses less digits than its factorization.

28947975446655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21458 (or 21452 counting only the distinct ones).

The product of its digits is 18289152000, while the sum is 81.

The spelling of 28947975446655 in words is "twenty-eight trillion, nine hundred forty-seven billion, nine hundred seventy-five million, four hundred forty-six thousand, six hundred fifty-five".