28478120244637 has 8 divisors (see below), whose sum is σ = 32549884492736. Its totient is φ = 24407221335552.

The previous prime is 28478120244559. The next prime is 28478120244641. The reversal of 28478120244637 is 73644202187482.

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 28478120244637 - 2¹¹ = 28478120242589 is a prime.

It is a super-2 number, since 2×28478120244637² (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 (28478120644637) 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, 216264228 + ... + 216395869.

It is an arithmetic number, because the mean of its divisors is an integer number (4068735561592).

Almost surely, 2^{28478120244637} is an apocalyptic number.

It is an amenable number.

28478120244637 is a deficient number, since it is larger than the sum of its proper divisors (4071764248099).

28478120244637 is an equidigital number, since it uses as much as digits as its factorization.

28478120244637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432669507.

The product of its (nonzero) digits is 28901376, while the sum is 58.

The spelling of 28478120244637 in words is "twenty-eight trillion, four hundred seventy-eight billion, one hundred twenty million, two hundred forty-four thousand, six hundred thirty-seven".