28378018 has 8 divisors (see below), whose sum is σ = 42639660. Its totient is φ = 14164800.

The previous prime is 28378003. The next prime is 28378057. The reversal of 28378018 is 81087382.

It can be written as a sum of positive squares in 2 ways, for example, as 28376929 + 1089 = 5327^2 + 33^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10603 + ... + 13006.

Almost surely, 2^28378018 is an apocalyptic number.

28378018 is a deficient number, since it is larger than the sum of its proper divisors (14261642).

28378018 is a wasteful number, since it uses less digits than its factorization.

28378018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24212.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28378018 is about 5327.1022141498. The cubic root of 28378018 is about 305.0193233301.

The spelling of 28378018 in words is "twenty-eight million, three hundred seventy-eight thousand, eighteen".