63644157 has 16 divisors (see below), whose sum is σ = 96295680. Its totient is φ = 41525856.

The previous prime is 63644137. The next prime is 63644173. The reversal of 63644157 is 75144636.

It is a happy number.

63644157 is a `hidden beast` number, since 6 + 3 + 644 + 1 + 5 + 7 = 666.

It is not a de Polignac number, because 63644157 - 2⁷ = 63644029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63644137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23808 + ... + 26345.

It is an arithmetic number, because the mean of its divisors is an integer number (6018480).

Almost surely, 2^63644157 is an apocalyptic number.

It is an amenable number.

63644157 is a deficient number, since it is larger than the sum of its proper divisors (32651523).

63644157 is a wasteful number, since it uses less digits than its factorization.

63644157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50209 (or 50203 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 63644157 is about 7977.7288121369. The cubic root of 63644157 is about 399.2572821959.

The spelling of 63644157 in words is "sixty-three million, six hundred forty-four thousand, one hundred fifty-seven".