28567980 has 216 divisors, whose sum is σ = 104569920. Its totient is φ = 6289920.

The previous prime is 28567967. The next prime is 28568003. The reversal of 28567980 is 8976582.

28567980 is a `hidden beast` number, since 2 + 8 + 567 + 9 + 80 = 666.

It is a super-2 number, since 2×28567980² = 1632258962560800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 361581 + ... + 361659.

It is an arithmetic number, because the mean of its divisors is an integer number (484120).

Almost surely, 2^28567980 is an apocalyptic number.

28567980 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 28567980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52284960).

28567980 is an abundant number, since it is smaller than the sum of its proper divisors (76001940).

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

28567980 is a wasteful number, since it uses less digits than its factorization.

28567980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28567980 is about 5344.9022441949. The cubic root of 28567980 is about 305.6984084771.

It can be divided in two parts, 285 and 67980, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 28567980 in words is "twenty-eight million, five hundred sixty-seven thousand, nine hundred eighty".