28706478 has 32 divisors (see below), whose sum is σ = 59808672. Its totient is φ = 9177600.

The previous prime is 28706477. The next prime is 28706497. The reversal of 28706478 is 87460782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28706477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14050 + ... + 15962.

It is an arithmetic number, because the mean of its divisors is an integer number (1869021).

Almost surely, 2^28706478 is an apocalyptic number.

28706478 is an abundant number, since it is smaller than the sum of its proper divisors (31102194).

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

28706478 is a wasteful number, since it uses less digits than its factorization.

28706478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 28706478 is about 5357.8426628635. The cubic root of 28706478 is about 306.1916224699.

The spelling of 28706478 in words is "twenty-eight million, seven hundred six thousand, four hundred seventy-eight".