63158640 has 80 divisors (see below), whose sum is σ = 197883168. Its totient is φ = 16662528.

The previous prime is 63158617. The next prime is 63158657. The reversal of 63158640 is 4685136.

Added to its reverse (4685136) it gives a triangular number (67843776 = T₁₁₆₄₈).

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

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, 21924 + ... + 24636.

Almost surely, 2^63158640 is an apocalyptic number.

63158640 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 63158640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98941584).

63158640 is an abundant number, since it is smaller than the sum of its proper divisors (134724528).

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

63158640 is a wasteful number, since it uses less digits than its factorization.

63158640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2820 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 63158640 is about 7947.2410306974. The cubic root of 63158640 is about 398.2394290101.

Adding to 63158640 its reverse (4685136), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 63158640 in words is "sixty-three million, one hundred fifty-eight thousand, six hundred forty".