28478906007551 has 4 divisors (see below), whose sum is σ = 28478916689400. Its totient is φ = 28478895325704.

The previous prime is 28478906007529. The next prime is 28478906007593. The reversal of 28478906007551 is 15570060987482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28478906007551 is a prime.

It is a super-2 number, since 2×28478906007551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478909007551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2346785 + ... + 7903493.

It is an arithmetic number, because the mean of its divisors is an integer number (7119729172350).

Almost surely, 2^{28478906007551} is an apocalyptic number.

28478906007551 is a deficient number, since it is larger than the sum of its proper divisors (10681849).

28478906007551 is an equidigital number, since it uses as much as digits as its factorization.

28478906007551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681848.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 28478906007551 in words is "twenty-eight trillion, four hundred seventy-eight billion, nine hundred six million, seven thousand, five hundred fifty-one".