28378747452 has 96 divisors (see below), whose sum is σ = 74133045504. Its totient is φ = 8374643200.

The previous prime is 28378747417. The next prime is 28378747483. The reversal of 28378747452 is 25474787382.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28378747392 and 28378747401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3172378 + ... + 3181310.

It is an arithmetic number, because the mean of its divisors is an integer number (772219224).

Almost surely, 2^28378747452 is an apocalyptic number.

28378747452 is a gapful number since it is divisible by the number (22) 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 28378747452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37066522752).

28378747452 is an abundant number, since it is smaller than the sum of its proper divisors (45754298052).

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

28378747452 is a wasteful number, since it uses less digits than its factorization.

28378747452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9579 (or 9577 counting only the distinct ones).

The product of its digits is 21073920, while the sum is 57.

The spelling of 28378747452 in words is "twenty-eight billion, three hundred seventy-eight million, seven hundred forty-seven thousand, four hundred fifty-two".