28478906007553 has 4 divisors (see below), whose sum is σ = 28730931724548. Its totient is φ = 28226880290560.

The previous prime is 28478906007529. The next prime is 28478906007593. The reversal of 28478906007553 is 35570060987482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1841250883329 + 26637655124224 = 1356927^2 + 5161168^2 .

It is a cyclic number.

It is not a de Polignac number, because 28478906007553 - 2¹⁷ = 28478905876481 is a prime.

It is a super-2 number, since 2×28478906007553² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28478906007593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126012858328 + ... + 126012858553.

It is an arithmetic number, because the mean of its divisors is an integer number (7182732931137).

Almost surely, 2^{28478906007553} is an apocalyptic number.

It is an amenable number.

28478906007553 is a deficient number, since it is larger than the sum of its proper divisors (252025716995).

28478906007553 is a wasteful number, since it uses less digits than its factorization.

28478906007553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252025716994.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 28478906007553 in words is "twenty-eight trillion, four hundred seventy-eight billion, nine hundred six million, seven thousand, five hundred fifty-three".