28478658 has 32 divisors (see below), whose sum is σ = 61641216. Its totient is φ = 8719488.

The previous prime is 28478657. The next prime is 28478683. The reversal of 28478658 is 85687482.

It is a super-2 number, since 2×28478658² = 1622067922961928, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28478657) 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 15 ways as a sum of consecutive naturals, for example, 17391 + ... + 18957.

It is an arithmetic number, because the mean of its divisors is an integer number (1926288).

Almost surely, 2^28478658 is an apocalyptic number.

28478658 is an abundant number, since it is smaller than the sum of its proper divisors (33162558).

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

28478658 is a wasteful number, since it uses less digits than its factorization.

28478658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818.

The product of its digits is 860160, while the sum is 48.

The square root of 28478658 is about 5336.5398902285. The cubic root of 28478658 is about 305.3794721354.

The spelling of 28478658 in words is "twenty-eight million, four hundred seventy-eight thousand, six hundred fifty-eight".