28320177240 has 48 divisors (see below), whose sum is σ = 92040577200. Its totient is φ = 7552047168.

The previous prime is 28320177203. The next prime is 28320177241. The reversal of 28320177240 is 4277102382.

28320177240 is a `hidden beast` number, since 28 + 320 + 1 + 77 + 240 = 666.

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 = 28320177195 and 28320177204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320177241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39333220 + ... + 39333939.

It is an arithmetic number, because the mean of its divisors is an integer number (1917512025).

Almost surely, 2^28320177240 is an apocalyptic number.

28320177240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28320177240 is an abundant number, since it is smaller than the sum of its proper divisors (63720399960).

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

28320177240 is a wasteful number, since it uses less digits than its factorization.

28320177240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78667176 (or 78667169 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 28320177240 in words is "twenty-eight billion, three hundred twenty million, one hundred seventy-seven thousand, two hundred forty".