28711525766420 has 96 divisors (see below), whose sum is σ = 69045113491200. Its totient is φ = 9824330041344.

The previous prime is 28711525766383. The next prime is 28711525766423. The reversal of 28711525766420 is 2466752511782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28711525766423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196348454 + ... + 196494626.

It is an arithmetic number, because the mean of its divisors is an integer number (719219932200).

Almost surely, 2^{28711525766420} is an apocalyptic number.

28711525766420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28711525766420 is an abundant number, since it is smaller than the sum of its proper divisors (40333587724780).

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

28711525766420 is a wasteful number, since it uses less digits than its factorization.

28711525766420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148977 (or 148975 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 56.

The spelling of 28711525766420 in words is "twenty-eight trillion, seven hundred eleven billion, five hundred twenty-five million, seven hundred sixty-six thousand, four hundred twenty".