28158540436 has 24 divisors (see below), whose sum is σ = 55861074080. Its totient is φ = 12312235872.

The previous prime is 28158540433. The next prime is 28158540439. The reversal of 28158540436 is 63404585182.

It is an interprime number because it is at equal distance from previous prime (28158540433) and next prime (28158540439).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28158540433) 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, 14249286 + ... + 14251261.

Almost surely, 2^28158540436 is an apocalyptic number.

28158540436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28158540436 is a deficient number, since it is larger than the sum of its proper divisors (27702533644).

28158540436 is a wasteful number, since it uses less digits than its factorization.

28158540436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28500583 (or 28500581 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 28158540436 in words is "twenty-eight billion, one hundred fifty-eight million, five hundred forty thousand, four hundred thirty-six".