28717020 has 36 divisors (see below), whose sum is σ = 87108840. Its totient is φ = 7657824.

The previous prime is 28717019. The next prime is 28717021. The reversal of 28717020 is 2071782.

It is an interprime number because it is at equal distance from previous prime (28717019) and next prime (28717021).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717021) 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, 79590 + ... + 79949.

It is an arithmetic number, because the mean of its divisors is an integer number (2419690).

Almost surely, 2^28717020 is an apocalyptic number.

28717020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28717020 is an abundant number, since it is smaller than the sum of its proper divisors (58391820).

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

28717020 is a wasteful number, since it uses less digits than its factorization.

28717020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159554 (or 159549 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 28717020 is about 5358.8263640465. The cubic root of 28717020 is about 306.2290992261.

The spelling of 28717020 in words is "twenty-eight million, seven hundred seventeen thousand, twenty".