28018951553 has 4 divisors (see below), whose sum is σ = 28114579668. Its totient is φ = 27923323440.

The previous prime is 28018951531. The next prime is 28018951603. The reversal of 28018951553 is 35515981082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24065937424 + 3953014129 = 155132^2 + 62873^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018951553 - 2¹² = 28018947457 is a prime.

It is a super-2 number, since 2×28018951553² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28018951498 and 28018951507.

It is not an unprimeable number, because it can be changed into a prime (28018941553) 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, 47813618 + ... + 47814203.

It is an arithmetic number, because the mean of its divisors is an integer number (7028644917).

Almost surely, 2^28018951553 is an apocalyptic number.

It is an amenable number.

28018951553 is a deficient number, since it is larger than the sum of its proper divisors (95628115).

28018951553 is an equidigital number, since it uses as much as digits as its factorization.

28018951553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95628114.

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 28018951553 in words is "twenty-eight billion, eighteen million, nine hundred fifty-one thousand, five hundred fifty-three".