28071918 has 24 divisors (see below), whose sum is σ = 69511728. Its totient is φ = 8020512.

The previous prime is 28071907. The next prime is 28071919. The reversal of 28071918 is 81917082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111271 + ... + 111522.

It is an arithmetic number, because the mean of its divisors is an integer number (2896322).

Almost surely, 2^28071918 is an apocalyptic number.

28071918 is an abundant number, since it is smaller than the sum of its proper divisors (41439810).

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

28071918 is a wasteful number, since it uses less digits than its factorization.

28071918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222808 (or 222805 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28071918 is about 5298.2938763342. The cubic root of 28071918 is about 303.9186575420.

The spelling of 28071918 in words is "twenty-eight million, seventy-one thousand, nine hundred eighteen".