63491280 has 80 divisors (see below), whose sum is σ = 198362304. Its totient is φ = 16798720.

The previous prime is 63491261. The next prime is 63491291. The reversal of 63491280 is 8219436.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×63491280² = 8062285272076800, which contains 22 as substring.

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, 31915 + ... + 33845.

Almost surely, 2^63491280 is an apocalyptic number.

63491280 is a gapful number since it is divisible by the number (60) 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 63491280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99181152).

63491280 is an abundant number, since it is smaller than the sum of its proper divisors (134871024).

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

63491280 is a wasteful number, since it uses less digits than its factorization.

63491280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 2078 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 63491280 is about 7968.1415650075. The cubic root of 63491280 is about 398.9373460833.

The spelling of 63491280 in words is "sixty-three million, four hundred ninety-one thousand, two hundred eighty".