28057730440 has 32 divisors (see below), whose sum is σ = 63196222680. Its totient is φ = 11211300352.

The previous prime is 28057730419. The next prime is 28057730447. The reversal of 28057730440 is 4403775082.

It can be written as a sum of positive squares in 4 ways, for example, as 23090018116 + 4967712324 = 151954^2 + 70482^2 .

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 = 28057730393 and 28057730402.

It is not an unprimeable number, because it can be changed into a prime (28057730447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329899 + ... + 406138.

Almost surely, 2^28057730440 is an apocalyptic number.

28057730440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28057730440 is an abundant number, since it is smaller than the sum of its proper divisors (35138492240).

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

28057730440 is a wasteful number, since it uses less digits than its factorization.

28057730440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737001 (or 736997 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 28057730440 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, four hundred forty".