28135567994 has 16 divisors (see below), whose sum is σ = 42689505600. Its totient is φ = 13906080384.

The previous prime is 28135567939. The next prime is 28135568003. The reversal of 28135567994 is 49976553182.

It is a happy number.

It is a super-2 number, since 2×28135567994² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76337 + ... + 249195.

It is an arithmetic number, because the mean of its divisors is an integer number (2668094100).

Almost surely, 2^28135567994 is an apocalyptic number.

28135567994 is a deficient number, since it is larger than the sum of its proper divisors (14553937606).

28135567994 is a wasteful number, since it uses less digits than its factorization.

28135567994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173797.

The product of its digits is 16329600, while the sum is 59.

The spelling of 28135567994 in words is "twenty-eight billion, one hundred thirty-five million, five hundred sixty-seven thousand, nine hundred ninety-four".