63643506 has 16 divisors (see below), whose sum is σ = 128899200. Its totient is φ = 20945808.

The previous prime is 63643471. The next prime is 63643519. The reversal of 63643506 is 60534636.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66661 + ... + 67608.

It is an arithmetic number, because the mean of its divisors is an integer number (8056200).

Almost surely, 2^63643506 is an apocalyptic number.

63643506 is an abundant number, since it is smaller than the sum of its proper divisors (65255694).

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

63643506 is a wasteful number, since it uses less digits than its factorization.

63643506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134353.

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 63643506 is about 7977.6880109465. The cubic root of 63643506 is about 399.2559208906.

It can be divided in two parts, 6364 and 3506, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 63643506 in words is "sixty-three million, six hundred forty-three thousand, five hundred six".