28127398316520 has 128 divisors (see below), whose sum is σ = 89086936348800. Its totient is φ = 7084783190016.

The previous prime is 28127398316513. The next prime is 28127398316527. The reversal of 28127398316520 is 2561389372182.

It is an interprime number because it is at equal distance from previous prime (28127398316513) and next prime (28127398316527).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (28127398316527) 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, 17535169 + ... + 19071888.

It is an arithmetic number, because the mean of its divisors is an integer number (695991690225).

Almost surely, 2^{28127398316520} is an apocalyptic number.

28127398316520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28127398316520 is an abundant number, since it is smaller than the sum of its proper divisors (60959538032280).

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

28127398316520 is a wasteful number, since it uses less digits than its factorization.

28127398316520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36607427 (or 36607423 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 28127398316520 in words is "twenty-eight trillion, one hundred twenty-seven billion, three hundred ninety-eight million, three hundred sixteen thousand, five hundred twenty".