28209577860 has 96 divisors (see below), whose sum is σ = 87842764800. Its totient is φ = 7515728640.

The previous prime is 28209577849. The next prime is 28209577871. The reversal of 28209577860 is 6877590282.

It is a happy number.

28209577860 is a `hidden beast` number, since 2 + 8 + 2 + 0 + 9 + 577 + 8 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (28209577849) and next prime (28209577871).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 28209577797 and 28209577806.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586525 + ... + 632795.

It is an arithmetic number, because the mean of its divisors is an integer number (915028800).

Almost surely, 2^28209577860 is an apocalyptic number.

28209577860 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 28209577860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43921382400).

28209577860 is an abundant number, since it is smaller than the sum of its proper divisors (59633186940).

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

28209577860 is a wasteful number, since it uses less digits than its factorization.

28209577860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47418 (or 47410 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 28209577860 in words is "twenty-eight billion, two hundred nine million, five hundred seventy-seven thousand, eight hundred sixty".