28662321408 has 144 divisors (see below), whose sum is σ = 91770040320. Its totient is φ = 7758194688.

The previous prime is 28662321397. The next prime is 28662321421. The reversal of 28662321408 is 80412326682.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 28662321408.

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, 38160 + ... + 242447.

Almost surely, 2^28662321408 is an apocalyptic number.

28662321408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28662321408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45885020160).

28662321408 is an abundant number, since it is smaller than the sum of its proper divisors (63107718912).

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

28662321408 is a wasteful number, since it uses less digits than its factorization.

28662321408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280652 (or 280638 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 28662321408 in words is "twenty-eight billion, six hundred sixty-two million, three hundred twenty-one thousand, four hundred eight".