28661005184447 has 8 divisors (see below), whose sum is σ = 29585655559680. Its totient is φ = 27736361173080.

The previous prime is 28661005184423. The next prime is 28661005184503. The reversal of 28661005184447 is 74448150016682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28661005184447 - 2³⁸ = 28386127277503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28661005184392 and 28661005184401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661005180447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8597504 + ... + 11455962.

It is an arithmetic number, because the mean of its divisors is an integer number (3698206944960).

Almost surely, 2^{28661005184447} is an apocalyptic number.

28661005184447 is a deficient number, since it is larger than the sum of its proper divisors (924650375233).

28661005184447 is a wasteful number, since it uses less digits than its factorization.

28661005184447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3181933.

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 28661005184447 in words is "twenty-eight trillion, six hundred sixty-one billion, five million, one hundred eighty-four thousand, four hundred forty-seven".