28552350640 has 120 divisors (see below), whose sum is σ = 73893395520. Its totient is φ = 10250972160.

The previous prime is 28552350637. The next prime is 28552350647. The reversal of 28552350640 is 4605325582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 28552350593 and 28552350602.

It is not an unprimeable number, because it can be changed into a prime (28552350647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 746052 + ... + 783388.

It is an arithmetic number, because the mean of its divisors is an integer number (615778296).

Almost surely, 2^28552350640 is an apocalyptic number.

28552350640 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 28552350640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36946697760).

28552350640 is an abundant number, since it is smaller than the sum of its proper divisors (45341044880).

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

28552350640 is a wasteful number, since it uses less digits than its factorization.

28552350640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37451 (or 37434 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 28552350640 in words is "twenty-eight billion, five hundred fifty-two million, three hundred fifty thousand, six hundred forty".