28742178 has 8 divisors (see below), whose sum is σ = 57484368. Its totient is φ = 9580724.

The previous prime is 28742173. The next prime is 28742179. The reversal of 28742178 is 87124782.

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

28742178 is an admirable number.

It is a super-2 number, since 2×28742178² = 1652225592367368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28742173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2395176 + ... + 2395187.

It is an arithmetic number, because the mean of its divisors is an integer number (7185546).

Almost surely, 2^28742178 is an apocalyptic number.

28742178 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28742178 is a wasteful number, since it uses less digits than its factorization.

28742178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790368.

The product of its digits is 50176, while the sum is 39.

The square root of 28742178 is about 5361.1731925018. The cubic root of 28742178 is about 306.3184987414.

It can be divided in two parts, 28742 and 178, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28742178 in words is "twenty-eight million, seven hundred forty-two thousand, one hundred seventy-eight".