27453998520 has 512 divisors, whose sum is σ = 103765536000. Its totient is φ = 6409912320.

The previous prime is 27453998497. The next prime is 27453998573. The reversal of 27453998520 is 2589935472.

27453998520 is a `hidden beast` number, since 2 + 7 + 4 + 539 + 9 + 85 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21298036 + ... + 21299324.

Almost surely, 2^27453998520 is an apocalyptic number.

27453998520 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 27453998520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51882768000).

27453998520 is an abundant number, since it is smaller than the sum of its proper divisors (76311537480).

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

27453998520 is a wasteful number, since it uses less digits than its factorization.

27453998520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400 (or 1390 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 27453998520 in words is "twenty-seven billion, four hundred fifty-three million, nine hundred ninety-eight thousand, five hundred twenty".