28915403775 has 12 divisors (see below), whose sum is σ = 47806801032. Its totient is φ = 15421548640.

The previous prime is 28915403771. The next prime is 28915403807. The reversal of 28915403775 is 57730451982.

It is not a de Polignac number, because 28915403775 - 2² = 28915403771 is a prime.

It is a super-2 number, since 2×28915403775² (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 (28915403771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192769284 + ... + 192769433.

It is an arithmetic number, because the mean of its divisors is an integer number (3983900086).

Almost surely, 2^28915403775 is an apocalyptic number.

28915403775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28915403775 is a deficient number, since it is larger than the sum of its proper divisors (18891397257).

28915403775 is a wasteful number, since it uses less digits than its factorization.

28915403775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385538730 (or 385538725 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 28915403775 in words is "twenty-eight billion, nine hundred fifteen million, four hundred three thousand, seven hundred seventy-five".