28471278 has 64 divisors (see below), whose sum is σ = 65007360. Its totient is φ = 8236800.

The previous prime is 28471271. The next prime is 28471279. The reversal of 28471278 is 87217482.

It is a super-2 number, since 2×28471278² = 1621227341906568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217273 + ... + 217403.

It is an arithmetic number, because the mean of its divisors is an integer number (1015740).

Almost surely, 2^28471278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28471278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32503680).

28471278 is an abundant number, since it is smaller than the sum of its proper divisors (36536082).

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

28471278 is a wasteful number, since it uses less digits than its factorization.

28471278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273.

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

The square root of 28471278 is about 5335.8483861519. The cubic root of 28471278 is about 305.3530910326.

The spelling of 28471278 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred seventy-eight".