28615906 has 16 divisors (see below), whose sum is σ = 46972800. Its totient is φ = 12966480.

The previous prime is 28615877. The next prime is 28615931. The reversal of 28615906 is 60951682.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5815 + ... + 9541.

It is an arithmetic number, because the mean of its divisors is an integer number (2935800).

Almost surely, 2^28615906 is an apocalyptic number.

28615906 is a deficient number, since it is larger than the sum of its proper divisors (18356894).

28615906 is a wasteful number, since it uses less digits than its factorization.

28615906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28615906 is about 5349.3837028204. The cubic root of 28615906 is about 305.8692607939.

The spelling of 28615906 in words is "twenty-eight million, six hundred fifteen thousand, nine hundred six".