28148401885 has 8 divisors (see below), whose sum is σ = 33779363256. Its totient is φ = 22517867520.

The previous prime is 28148401873. The next prime is 28148401909. The reversal of 28148401885 is 58810484182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1442632324 + 26705769561 = 37982^2 + 163419^2 .

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

It is not a de Polignac number, because 28148401885 - 2²¹ = 28146304733 is a prime.

It is a super-3 number, since 3×28148401885³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62745 + ... + 245425.

It is an arithmetic number, because the mean of its divisors is an integer number (4222420407).

Almost surely, 2^28148401885 is an apocalyptic number.

It is an amenable number.

28148401885 is a deficient number, since it is larger than the sum of its proper divisors (5630961371).

28148401885 is a wasteful number, since it uses less digits than its factorization.

28148401885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213503.

The product of its (nonzero) digits is 655360, while the sum is 49.

The spelling of 28148401885 in words is "twenty-eight billion, one hundred forty-eight million, four hundred one thousand, eight hundred eighty-five".