28777580 has 48 divisors (see below), whose sum is σ = 65601984. Its totient is φ = 10540800.

The previous prime is 28777561. The next prime is 28777591. The reversal of 28777580 is 8577782.

It is a super-2 number, since 2×28777580² = 1656298221312800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38894 + ... + 39626.

It is an arithmetic number, because the mean of its divisors is an integer number (1366708).

Almost surely, 2^28777580 is an apocalyptic number.

28777580 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 28777580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32800992).

28777580 is an abundant number, since it is smaller than the sum of its proper divisors (36824404).

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

28777580 is a wasteful number, since it uses less digits than its factorization.

28777580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 28777580 is about 5364.4738791423. The cubic root of 28777580 is about 306.4442122277. Note that the first 3 decimals are identical.

The spelling of 28777580 in words is "twenty-eight million, seven hundred seventy-seven thousand, five hundred eighty".