63171520 has 56 divisors (see below), whose sum is σ = 151845264. Its totient is φ = 25030656.

The previous prime is 63171517. The next prime is 63171527. The reversal of 63171520 is 2517136.

It is a super-2 number, since 2×63171520² = 7981281878220800, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63171527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35287 + ... + 37033.

Almost surely, 2^63171520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63171520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75922632).

63171520 is an abundant number, since it is smaller than the sum of its proper divisors (88673744).

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

63171520 is a wasteful number, since it uses less digits than its factorization.

63171520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 63171520 is about 7948.0513335031. The cubic root of 63171520 is about 398.2664982820.

Adding to 63171520 its reverse (2517136), we get a palindrome (65688656).

The spelling of 63171520 in words is "sixty-three million, one hundred seventy-one thousand, five hundred twenty".