28639350 has 72 divisors (see below), whose sum is σ = 79465152. Its totient is φ = 7387200.

The previous prime is 28639337. The next prime is 28639363. The reversal of 28639350 is 5393682.

It is an interprime number because it is at equal distance from previous prime (28639337) and next prime (28639363).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 12924 + ... + 14976.

Almost surely, 2^28639350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28639350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39732576).

28639350 is an abundant number, since it is smaller than the sum of its proper divisors (50825802).

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

28639350 is a wasteful number, since it uses less digits than its factorization.

28639350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 28639350 is about 5351.5745346580. The cubic root of 28639350 is about 305.9527672836.

The spelling of 28639350 in words is "twenty-eight million, six hundred thirty-nine thousand, three hundred fifty".