28398642240 has 112 divisors (see below), whose sum is σ = 90200512512. Its totient is φ = 7570046976.

The previous prime is 28398642229. The next prime is 28398642343. The reversal of 28398642240 is 4224689382.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28398642240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3804592 + ... + 3812048.

Almost surely, 2^28398642240 is an apocalyptic number.

28398642240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28398642240 is an abundant number, since it is smaller than the sum of its proper divisors (61801870272).

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

28398642240 is a wasteful number, since it uses less digits than its factorization.

28398642240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444 (or 11434 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 28398642240 in words is "twenty-eight billion, three hundred ninety-eight million, six hundred forty-two thousand, two hundred forty".