28478197020047 has 4 divisors (see below), whose sum is σ = 29140480671720. Its totient is φ = 27815913368376.

The previous prime is 28478197020037. The next prime is 28478197020071. The reversal of 28478197020047 is 74002079187482.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28478197020047 - 2¹² = 28478197015951 is a prime.

It is a super-2 number, since 2×28478197020047² (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 (28478197020037) 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, 331141825772 + ... + 331141825857.

It is an arithmetic number, because the mean of its divisors is an integer number (7285120167930).

Almost surely, 2^{28478197020047} is an apocalyptic number.

28478197020047 is a deficient number, since it is larger than the sum of its proper divisors (662283651673).

28478197020047 is an equidigital number, since it uses as much as digits as its factorization.

28478197020047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662283651672.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The spelling of 28478197020047 in words is "twenty-eight trillion, four hundred seventy-eight billion, one hundred ninety-seven million, twenty thousand, forty-seven".