625730421 has 16 divisors (see below), whose sum is σ = 859607424. Its totient is φ = 404576064.

The previous prime is 625730393. The next prime is 625730423. The reversal of 625730421 is 124037526.

It is not a de Polignac number, because 625730421 - 2⁷ = 625730293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625730423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26296 + ... + 44078.

It is an arithmetic number, because the mean of its divisors is an integer number (53725464).

Almost surely, 2^625730421 is an apocalyptic number.

It is an amenable number.

625730421 is a deficient number, since it is larger than the sum of its proper divisors (233877003).

625730421 is a wasteful number, since it uses less digits than its factorization.

625730421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18140.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 625730421 is about 25014.6041543735. The cubic root of 625730421 is about 855.3209109645.

Adding to 625730421 its reverse (124037526), we get a palindrome (749767947).

The spelling of 625730421 in words is "six hundred twenty-five million, seven hundred thirty thousand, four hundred twenty-one".