28415987919 has 16 divisors (see below), whose sum is σ = 45924829440. Its totient is φ = 17221810680.

The previous prime is 28415987911. The next prime is 28415987921. The reversal of 28415987919 is 91978951482.

28415987919 is a `hidden beast` number, since 28 + 4 + 1 + 598 + 7 + 9 + 19 = 666.

It is not a de Polignac number, because 28415987919 - 2³ = 28415987911 is a prime.

It is a super-2 number, since 2×28415987919² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28415987911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47838067 + ... + 47838660.

It is an arithmetic number, because the mean of its divisors is an integer number (2870301840).

Almost surely, 2^28415987919 is an apocalyptic number.

28415987919 is a deficient number, since it is larger than the sum of its proper divisors (17508841521).

28415987919 is a wasteful number, since it uses less digits than its factorization.

28415987919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95676747 (or 95676741 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 28415987919 in words is "twenty-eight billion, four hundred fifteen million, nine hundred eighty-seven thousand, nine hundred nineteen".