28708386 has 32 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 8179536.

The previous prime is 28708357. The next prime is 28708403. The reversal of 28708386 is 68380782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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, 19405 + ... + 20831.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^28708386 is an apocalyptic number.

28708386 is an abundant number, since it is smaller than the sum of its proper divisors (37093854).

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

28708386 is a wasteful number, since it uses less digits than its factorization.

28708386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28708386 is about 5358.0207166453. The cubic root of 28708386 is about 306.1984060801.

The spelling of 28708386 in words is "twenty-eight million, seven hundred eight thousand, three hundred eighty-six".