28735980 has 192 divisors, whose sum is σ = 104616960. Its totient is φ = 5723136.

The previous prime is 28735979. The next prime is 28736021. The reversal of 28735980 is 8953782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 103602 + ... + 103878.

It is an arithmetic number, because the mean of its divisors is an integer number (544880).

Almost surely, 2^28735980 is an apocalyptic number.

28735980 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 28735980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52308480).

28735980 is an abundant number, since it is smaller than the sum of its proper divisors (75880980).

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

28735980 is a wasteful number, since it uses less digits than its factorization.

28735980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28735980 is about 5360.5951162161. The cubic root of 28735980 is about 306.2964788543.

The spelling of 28735980 in words is "twenty-eight million, seven hundred thirty-five thousand, nine hundred eighty".