63997605 has 144 divisors (see below), whose sum is σ = 145591680. Its totient is φ = 25380864.

The previous prime is 63997603. The next prime is 63997607. The reversal of 63997605 is 50679936.

63997605 is a `hidden beast` number, since 6 + 39 + 9 + 7 + 605 = 666.

It is an interprime number because it is at equal distance from previous prime (63997603) and next prime (63997607).

It is not a de Polignac number, because 63997605 - 2¹ = 63997603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63997603) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1729647 + ... + 1729683.

Almost surely, 2^63997605 is an apocalyptic number.

It is an amenable number.

63997605 is an abundant number, since it is smaller than the sum of its proper divisors (81594075).

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

63997605 is a wasteful number, since it uses less digits than its factorization.

63997605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 63997605 is about 7999.8503110996. The cubic root of 63997605 is about 399.9950103544.

The spelling of 63997605 in words is "sixty-three million, nine hundred ninety-seven thousand, six hundred five".