625138463 has 4 divisors (see below), whose sum is σ = 625557000. Its totient is φ = 624719928.

The previous prime is 625138447. The next prime is 625138489. The reversal of 625138463 is 364831526.

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

It is a cyclic number.

It is not a de Polignac number, because 625138463 - 2⁴ = 625138447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625138663) 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, 207020 + ... + 210017.

It is an arithmetic number, because the mean of its divisors is an integer number (156389250).

Almost surely, 2^625138463 is an apocalyptic number.

625138463 is a deficient number, since it is larger than the sum of its proper divisors (418537).

625138463 is a wasteful number, since it uses less digits than its factorization.

625138463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418536.

The product of its digits is 103680, while the sum is 38.

The square root of 625138463 is about 25002.7691066410. The cubic root of 625138463 is about 855.0511069162.

Adding to 625138463 its reverse (364831526), we get a palindrome (989969989).

The spelling of 625138463 in words is "six hundred twenty-five million, one hundred thirty-eight thousand, four hundred sixty-three".