28158001278 has 16 divisors (see below), whose sum is σ = 61435639296. Its totient is φ = 8532727640.

The previous prime is 28158001271. The next prime is 28158001297. The reversal of 28158001278 is 87210085182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28158001271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213318126 + ... + 213318257.

It is an arithmetic number, because the mean of its divisors is an integer number (3839727456).

Almost surely, 2^28158001278 is an apocalyptic number.

28158001278 is an abundant number, since it is smaller than the sum of its proper divisors (33277638018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28158001278 is a wasteful number, since it uses less digits than its factorization.

28158001278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426636399.

The product of its (nonzero) digits is 71680, while the sum is 42.

The spelling of 28158001278 in words is "twenty-eight billion, one hundred fifty-eight million, one thousand, two hundred seventy-eight".