28781182371 has 8 divisors (see below), whose sum is σ = 38378814480. Its totient is φ = 19185502592.

The previous prime is 28781182369. The next prime is 28781182433. The reversal of 28781182371 is 17328118782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28781182371 - 2¹ = 28781182369 is a prime.

It is a super-2 number, since 2×28781182371² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28781182371.

It is not an unprimeable number, because it can be changed into a prime (28781182361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453330 + ... + 512903.

It is an arithmetic number, because the mean of its divisors is an integer number (4797351810).

Almost surely, 2^28781182371 is an apocalyptic number.

28781182371 is a deficient number, since it is larger than the sum of its proper divisors (9597632109).

28781182371 is an equidigital number, since it uses as much as digits as its factorization.

28781182371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976165.

The product of its digits is 301056, while the sum is 48.

The spelling of 28781182371 in words is "twenty-eight billion, seven hundred eighty-one million, one hundred eighty-two thousand, three hundred seventy-one".