28772752640 has 36 divisors (see below), whose sum is σ = 68919737124. Its totient is φ = 11509100544.

The previous prime is 28772752621. The next prime is 28772752643. The reversal of 28772752640 is 4625727782.

It can be written as a sum of positive squares in 2 ways, for example, as 5468898304 + 23303854336 = 73952^2 + 152656^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772752643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11238077 + ... + 11240636.

Almost surely, 2^28772752640 is an apocalyptic number.

28772752640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28772752640 is an abundant number, since it is smaller than the sum of its proper divisors (40146984484).

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

28772752640 is an equidigital number, since it uses as much as digits as its factorization.

28772752640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22478734 (or 22478720 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 50.

The spelling of 28772752640 in words is "twenty-eight billion, seven hundred seventy-two million, seven hundred fifty-two thousand, six hundred forty".