28919292005 has 16 divisors (see below), whose sum is σ = 35262282864. Its totient is φ = 22764188160.

The previous prime is 28919292001. The next prime is 28919292011. The reversal of 28919292005 is 50029291982.

It can be written as a sum of positive squares in 8 ways, for example, as 13355731489 + 15563560516 = 115567^2 + 124754^2 .

It is not a de Polignac number, because 28919292005 - 2² = 28919292001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919292001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59567 + ... + 247763.

It is an arithmetic number, because the mean of its divisors is an integer number (2203892679).

Almost surely, 2^28919292005 is an apocalyptic number.

It is an amenable number.

28919292005 is a deficient number, since it is larger than the sum of its proper divisors (6342990859).

28919292005 is a wasteful number, since it uses less digits than its factorization.

28919292005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188696.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 28919292005 in words is "twenty-eight billion, nine hundred nineteen million, two hundred ninety-two thousand, five".