63521976 has 64 divisors (see below), whose sum is σ = 187361280. Its totient is φ = 17562240.

The previous prime is 63521893. The next prime is 63521981. The reversal of 63521976 is 67912536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891 + ... + 11306.

It is an arithmetic number, because the mean of its divisors is an integer number (2927520).

Almost surely, 2^63521976 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 63521976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93680640).

63521976 is an abundant number, since it is smaller than the sum of its proper divisors (123839304).

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

63521976 is a wasteful number, since it uses less digits than its factorization.

63521976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12244 (or 12240 counting only the distinct ones).

The product of its digits is 68040, while the sum is 39.

The square root of 63521976 is about 7970.0675028509. The cubic root of 63521976 is about 399.0016268676.

The spelling of 63521976 in words is "sixty-three million, five hundred twenty-one thousand, nine hundred seventy-six".