28645221554 has 8 divisors (see below), whose sum is σ = 43252387968. Its totient is φ = 14227758900.

The previous prime is 28645221551. The next prime is 28645221559. The reversal of 28645221554 is 45512254682.

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

It is not an unprimeable number, because it can be changed into a prime (28645221551) 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, 47425562 + ... + 47426165.

It is an arithmetic number, because the mean of its divisors is an integer number (5406548496).

Almost surely, 2^28645221554 is an apocalyptic number.

28645221554 is a deficient number, since it is larger than the sum of its proper divisors (14607166414).

28645221554 is a wasteful number, since it uses less digits than its factorization.

28645221554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94851880.

The product of its digits is 768000, while the sum is 44.

The spelling of 28645221554 in words is "twenty-eight billion, six hundred forty-five million, two hundred twenty-one thousand, five hundred fifty-four".