28906436 has 36 divisors (see below), whose sum is σ = 55754244. Its totient is φ = 13104000.

The previous prime is 28906433. The next prime is 28906463. The reversal of 28906436 is 63460982.

It can be written as a sum of positive squares in 6 ways, for example, as 6400900 + 22505536 = 2530^2 + 4744^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28906436.

It is not an unprimeable number, because it can be changed into a prime (28906433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40886 + ... + 41586.

It is an arithmetic number, because the mean of its divisors is an integer number (1548729).

Almost surely, 2^28906436 is an apocalyptic number.

28906436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28906436 is a deficient number, since it is larger than the sum of its proper divisors (26847808).

28906436 is a wasteful number, since it uses less digits than its factorization.

28906436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 28906436 is about 5376.4705895225. The cubic root of 28906436 is about 306.9009148062.

The spelling of 28906436 in words is "twenty-eight million, nine hundred six thousand, four hundred thirty-six".