28507505380311 has 4 divisors (see below), whose sum is σ = 38010007173752. Its totient is φ = 19005003586872.

The previous prime is 28507505380307. The next prime is 28507505380373. The reversal of 28507505380311 is 11308350570582.

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

It is not a de Polignac number, because 28507505380311 - 2² = 28507505380307 is a prime.

It is a super-2 number, since 2×28507505380311² (a number of 28 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 (28507505382311) 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, 4751250896716 + ... + 4751250896721.

It is an arithmetic number, because the mean of its divisors is an integer number (9502501793438).

Almost surely, 2^{28507505380311} is an apocalyptic number.

28507505380311 is a deficient number, since it is larger than the sum of its proper divisors (9502501793441).

28507505380311 is an equidigital number, since it uses as much as digits as its factorization.

28507505380311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502501793440.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 28507505380311 in words is "twenty-eight trillion, five hundred seven billion, five hundred five million, three hundred eighty thousand, three hundred eleven".