28316445520 has 80 divisors (see below), whose sum is σ = 71906522688. Its totient is φ = 10284600320.

The previous prime is 28316445517. The next prime is 28316445523. The reversal of 28316445520 is 2554461382.

It is an interprime number because it is at equal distance from previous prime (28316445517) and next prime (28316445523).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28316445523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 735387 + ... + 772933.

Almost surely, 2^28316445520 is an apocalyptic number.

28316445520 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 28316445520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35953261344).

28316445520 is an abundant number, since it is smaller than the sum of its proper divisors (43590077168).

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

28316445520 is a wasteful number, since it uses less digits than its factorization.

28316445520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38428 (or 38422 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 28316445520 in words is "twenty-eight billion, three hundred sixteen million, four hundred forty-five thousand, five hundred twenty".