28623132440 has 96 divisors (see below), whose sum is σ = 75420234000. Its totient is φ = 9747682560.

The previous prime is 28623132409. The next prime is 28623132457. The reversal of 28623132440 is 4423132682.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 28623132440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243035 + ... + 341045.

Almost surely, 2^28623132440 is an apocalyptic number.

28623132440 is a gapful number since it is divisible by the number (20) 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 28623132440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37710117000).

28623132440 is an abundant number, since it is smaller than the sum of its proper divisors (46797101560).

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

28623132440 is a wasteful number, since it uses less digits than its factorization.

28623132440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98185 (or 98174 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 28623132440 in words is "twenty-eight billion, six hundred twenty-three million, one hundred thirty-two thousand, four hundred forty".