63405257 has 4 divisors (see below), whose sum is σ = 67134996. Its totient is φ = 59675520.

The previous prime is 63405253. The next prime is 63405259. The reversal of 63405257 is 75250436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37405456 + 25999801 = 6116^2 + 5099^2 .

It is a cyclic number.

It is not a de Polignac number, because 63405257 - 2² = 63405253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63405253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1864844 + ... + 1864877.

It is an arithmetic number, because the mean of its divisors is an integer number (16783749).

Almost surely, 2^63405257 is an apocalyptic number.

It is an amenable number.

63405257 is a deficient number, since it is larger than the sum of its proper divisors (3729739).

63405257 is a wasteful number, since it uses less digits than its factorization.

63405257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729738.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 63405257 is about 7962.7418016661. The cubic root of 63405257 is about 398.7570940454.

The spelling of 63405257 in words is "sixty-three million, four hundred five thousand, two hundred fifty-seven".