28939716 has 36 divisors (see below), whose sum is σ = 78781612. Its totient is φ = 8904384.

The previous prime is 28939711. The next prime is 28939721. The reversal of 28939716 is 61793982.

It is an interprime number because it is at equal distance from previous prime (28939711) and next prime (28939721).

It can be written as a sum of positive squares in 2 ways, for example, as 6812100 + 22127616 = 2610^2 + 4704^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28939711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30451 + ... + 31386.

Almost surely, 2^28939716 is an apocalyptic number.

28939716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28939716 is an abundant number, since it is smaller than the sum of its proper divisors (49841896).

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

28939716 is a wasteful number, since it uses less digits than its factorization.

28939716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61860 (or 61855 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 28939716 is about 5379.5646664019. The cubic root of 28939716 is about 307.0186480483.

The spelling of 28939716 in words is "twenty-eight million, nine hundred thirty-nine thousand, seven hundred sixteen".