28071994 has 8 divisors (see below), whose sum is σ = 42542388. Its totient is φ = 13891200.

The previous prime is 28071977. The next prime is 28071997. The reversal of 28071994 is 49917082.

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 34969 = 5295^2 + 187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28071997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72157 + ... + 72544.

Almost surely, 2^28071994 is an apocalyptic number.

28071994 is a deficient number, since it is larger than the sum of its proper divisors (14470394).

28071994 is a wasteful number, since it uses less digits than its factorization.

28071994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144800.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 28071994 is about 5298.3010484494. The cubic root of 28071994 is about 303.9189318113.

The spelling of 28071994 in words is "twenty-eight million, seventy-one thousand, nine hundred ninety-four".