28523561040 has 120 divisors (see below), whose sum is σ = 103160246280. Its totient is φ = 7021181952.

The previous prime is 28523560981. The next prime is 28523561057. The reversal of 28523561040 is 4016532582.

28523561040 is a `hidden beast` number, since 2 + 8 + 5 + 2 + 35 + 610 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4296015936 + 24227545104 = 65544^2 + 155652^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28523560986 and 28523561004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1514335 + ... + 1533054.

It is an arithmetic number, because the mean of its divisors is an integer number (859668719).

Almost surely, 2^28523561040 is an apocalyptic number.

28523561040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28523561040 is an abundant number, since it is smaller than the sum of its proper divisors (74636685240).

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

28523561040 is a wasteful number, since it uses less digits than its factorization.

28523561040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047421 (or 3047412 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 28523561040 in words is "twenty-eight billion, five hundred twenty-three million, five hundred sixty-one thousand, forty".