625688257 has 4 divisors (see below), whose sum is σ = 625752496. Its totient is φ = 625624020.

The previous prime is 625688243. The next prime is 625688263. The reversal of 625688257 is 752886526.

625688257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 625688257 - 2¹⁵ = 625655489 is a prime.

It is a super-3 number, since 3×625688257³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 625688257.

It is not an unprimeable number, because it can be changed into a prime (625688857) 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, 14163 + ... + 38104.

It is an arithmetic number, because the mean of its divisors is an integer number (156438124).

Almost surely, 2^625688257 is an apocalyptic number.

It is an amenable number.

625688257 is a deficient number, since it is larger than the sum of its proper divisors (64239).

625688257 is a wasteful number, since it uses less digits than its factorization.

625688257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64238.

The product of its digits is 1612800, while the sum is 49.

The square root of 625688257 is about 25013.7613525035. The cubic root of 625688257 is about 855.3016989845.

The spelling of 625688257 in words is "six hundred twenty-five million, six hundred eighty-eight thousand, two hundred fifty-seven".