28002520 has 128 divisors (see below), whose sum is σ = 79632000. Its totient is φ = 8805888.

The previous prime is 28002511. The next prime is 28002529. The reversal of 28002520 is 2520082.

It is an interprime number because it is at equal distance from previous prime (28002511) and next prime (28002529).

It is a super-2 number, since 2×28002520² = 1568282252700800, which contains 22 as substring.

28002520 is a modest number, since divided by 2520 gives 280 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28002529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178282 + ... + 178438.

It is an arithmetic number, because the mean of its divisors is an integer number (622125).

Almost surely, 2^28002520 is an apocalyptic number.

28002520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28002520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39816000).

28002520 is an abundant number, since it is smaller than the sum of its proper divisors (51629480).

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

28002520 is a wasteful number, since it uses less digits than its factorization.

28002520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 28002520 is about 5291.7407343898. The cubic root of 28002520 is about 303.6680066812.

The spelling of 28002520 in words is "twenty-eight million, two thousand, five hundred twenty".