28963771240 has 72 divisors (see below), whose sum is σ = 66274143570. Its totient is φ = 11392194240.

The previous prime is 28963771117. The next prime is 28963771241. The reversal of 28963771240 is 4217736982.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26067394116 + 2896377124 = 161454^2 + 53818^2 .

It is a super-2 number, since 2×28963771240² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28963771241) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 76421371 + ... + 76421749.

Almost surely, 2^28963771240 is an apocalyptic number.

28963771240 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 28963771240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33137071785).

28963771240 is an abundant number, since it is smaller than the sum of its proper divisors (37310372330).

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

28963771240 is an frugal number, since it uses more digits than its factorization.

28963771240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 28963771240 in words is "twenty-eight billion, nine hundred sixty-three million, seven hundred seventy-one thousand, two hundred forty".