28131258344345 has 32 divisors (see below), whose sum is σ = 36493845373440. Its totient is φ = 20694161917440.

The previous prime is 28131258344339. The next prime is 28131258344347. The reversal of 28131258344345 is 54344385213182.

It is a happy number.

It is not a de Polignac number, because 28131258344345 - 2³⁰ = 28130184602521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28131258344347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32093492 + ... + 32958378.

It is an arithmetic number, because the mean of its divisors is an integer number (1140432667920).

Almost surely, 2^{28131258344345} is an apocalyptic number.

It is an amenable number.

28131258344345 is a deficient number, since it is larger than the sum of its proper divisors (8362587029095).

28131258344345 is a wasteful number, since it uses less digits than its factorization.

28131258344345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866825.

The product of its digits is 11059200, while the sum is 53.

The spelling of 28131258344345 in words is "twenty-eight trillion, one hundred thirty-one billion, two hundred fifty-eight million, three hundred forty-four thousand, three hundred forty-five".