28981213919 has 16 divisors (see below), whose sum is σ = 33378441216. Its totient is φ = 24648624000.

The previous prime is 28981213907. The next prime is 28981213951. The reversal of 28981213919 is 91931218982.

It is a happy number.

It is not a de Polignac number, because 28981213919 - 2⁸ = 28981213663 is a prime.

It is a super-2 number, since 2×28981213919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28981203919) 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, 947879 + ... + 977975.

It is an arithmetic number, because the mean of its divisors is an integer number (2086152576).

Almost surely, 2^28981213919 is an apocalyptic number.

28981213919 is a deficient number, since it is larger than the sum of its proper divisors (4397227297).

28981213919 is a wasteful number, since it uses less digits than its factorization.

28981213919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31166.

The product of its digits is 559872, while the sum is 53.

The spelling of 28981213919 in words is "twenty-eight billion, nine hundred eighty-one million, two hundred thirteen thousand, nine hundred nineteen".