28747897920 has 280 divisors, whose sum is σ = 116870829504. Its totient is φ = 6570906624.

The previous prime is 28747897909. The next prime is 28747897951. The reversal of 28747897920 is 2979874782.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 102219 + ... + 260661.

Almost surely, 2^28747897920 is an apocalyptic number.

28747897920 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 28747897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58435414752).

28747897920 is an abundant number, since it is smaller than the sum of its proper divisors (88122931584).

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

28747897920 is a wasteful number, since it uses less digits than its factorization.

28747897920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158479 (or 158460 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 28747897920 in words is "twenty-eight billion, seven hundred forty-seven million, eight hundred ninety-seven thousand, nine hundred twenty".