28400365511 has 4 divisors (see below), whose sum is σ = 32457560592. Its totient is φ = 24343170432.

The previous prime is 28400365507. The next prime is 28400365571. The reversal of 28400365511 is 11556300482.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28400365511 - 2² = 28400365507 is a prime.

It is a super-2 number, since 2×28400365511² (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 (28400365571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028597530 + ... + 2028597543.

It is an arithmetic number, because the mean of its divisors is an integer number (8114390148).

Almost surely, 2^28400365511 is an apocalyptic number.

28400365511 is a deficient number, since it is larger than the sum of its proper divisors (4057195081).

28400365511 is an equidigital number, since it uses as much as digits as its factorization.

28400365511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057195080.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 28400365511 its reverse (11556300482), we get a palindrome (39956665993).

The spelling of 28400365511 in words is "twenty-eight billion, four hundred million, three hundred sixty-five thousand, five hundred eleven".