28931630 has 32 divisors (see below), whose sum is σ = 64096704. Its totient is φ = 9156096.

The previous prime is 28931621. The next prime is 28931641. The reversal of 28931630 is 3613982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14987 + ... + 16806.

It is an arithmetic number, because the mean of its divisors is an integer number (2003022).

Almost surely, 2^28931630 is an apocalyptic number.

28931630 is an abundant number, since it is smaller than the sum of its proper divisors (35165074).

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

28931630 is a wasteful number, since it uses less digits than its factorization.

28931630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31820.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28931630 is about 5378.8130660955. The cubic root of 28931630 is about 306.9900508541.

The spelling of 28931630 in words is "twenty-eight million, nine hundred thirty-one thousand, six hundred thirty".