28916461821 has 32 divisors (see below), whose sum is σ = 42984603648. Its totient is φ = 17170845120.

The previous prime is 28916461813. The next prime is 28916461867. The reversal of 28916461821 is 12816461982.

It is not a de Polignac number, because 28916461821 - 2³ = 28916461813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28916461891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385060 + ... + 453986.

It is an arithmetic number, because the mean of its divisors is an integer number (1343268864).

Almost surely, 2^28916461821 is an apocalyptic number.

It is an amenable number.

28916461821 is a deficient number, since it is larger than the sum of its proper divisors (14068141827).

28916461821 is a wasteful number, since it uses less digits than its factorization.

28916461821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69321.

The product of its digits is 331776, while the sum is 48.

The spelling of 28916461821 in words is "twenty-eight billion, nine hundred sixteen million, four hundred sixty-one thousand, eight hundred twenty-one".