28219144557 has 16 divisors (see below), whose sum is σ = 38433795840. Its totient is φ = 18408789312.

The previous prime is 28219144553. The next prime is 28219144589. The reversal of 28219144557 is 75544191282.

It is not a de Polignac number, because 28219144557 - 2² = 28219144553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28219144553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802419 + ... + 836847.

It is an arithmetic number, because the mean of its divisors is an integer number (2402112240).

Almost surely, 2^28219144557 is an apocalyptic number.

It is an amenable number.

28219144557 is a deficient number, since it is larger than the sum of its proper divisors (10214651283).

28219144557 is a wasteful number, since it uses less digits than its factorization.

28219144557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40292.

The product of its digits is 806400, while the sum is 48.

The spelling of 28219144557 in words is "twenty-eight billion, two hundred nineteen million, one hundred forty-four thousand, five hundred fifty-seven".