63715257 has 6 divisors (see below), whose sum is σ = 92033162. Its totient is φ = 42476832.

The previous prime is 63715243. The next prime is 63715259. The reversal of 63715257 is 75251736.

63715257 is a `hidden beast` number, since 63 + 71 + 525 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61168041 + 2547216 = 7821^2 + 1596^2 .

It is not a de Polignac number, because 63715257 - 2⁴ = 63715241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63715259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3539728 + ... + 3539745.

Almost surely, 2^63715257 is an apocalyptic number.

It is an amenable number.

63715257 is a deficient number, since it is larger than the sum of its proper divisors (28317905).

63715257 is a wasteful number, since it uses less digits than its factorization.

63715257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079479 (or 7079476 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 63715257 is about 7982.1837237688. The cubic root of 63715257 is about 399.4059034768.

It can be divided in two parts, 6371 and 5257, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 63715257 in words is "sixty-three million, seven hundred fifteen thousand, two hundred fifty-seven".