625626781 has 4 divisors (see below), whose sum is σ = 673751932. Its totient is φ = 577501632.

The previous prime is 625626769. The next prime is 625626811. The reversal of 625626781 is 187626526.

625626781 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.

It can be written as a sum of positive squares in 2 ways, for example, as 121220100 + 504406681 = 11010^2 + 22459^2 .

It is a cyclic number.

It is not a de Polignac number, because 625626781 - 2⁹ = 625626269 is a prime.

It is a super-2 number, since 2×625626781² = 782817738208843922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625626731) 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, 24062556 + ... + 24062581.

It is an arithmetic number, because the mean of its divisors is an integer number (168437983).

Almost surely, 2^625626781 is an apocalyptic number.

It is an amenable number.

625626781 is a deficient number, since it is larger than the sum of its proper divisors (48125151).

625626781 is a wasteful number, since it uses less digits than its factorization.

625626781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48125150.

The product of its digits is 241920, while the sum is 43.

The square root of 625626781 is about 25012.5324787395. The cubic root of 625626781 is about 855.2736859664.

The spelling of 625626781 in words is "six hundred twenty-five million, six hundred twenty-six thousand, seven hundred eighty-one".