28288149920 has 24 divisors (see below), whose sum is σ = 66830754564. Its totient is φ = 11315259904.

The previous prime is 28288149917. The next prime is 28288149947. The reversal of 28288149920 is 2994188282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28053570064 + 234579856 = 167492^2 + 15316^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88400309 + ... + 88400628.

Almost surely, 2^28288149920 is an apocalyptic number.

28288149920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28288149920 is an abundant number, since it is smaller than the sum of its proper divisors (38542604644).

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

28288149920 is a wasteful number, since it uses less digits than its factorization.

28288149920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176800952 (or 176800944 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 28288149920 in words is "twenty-eight billion, two hundred eighty-eight million, one hundred forty-nine thousand, nine hundred twenty".