625687816 has 16 divisors (see below), whose sum is σ = 1263408300. Its totient is φ = 288778944.

The previous prime is 625687801. The next prime is 625687897. The reversal of 625687816 is 618786526.

It can be written as a sum of positive squares in 2 ways, for example, as 577440900 + 48246916 = 24030^2 + 6946^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 625687816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3008011 + ... + 3008218.

Almost surely, 2^625687816 is an apocalyptic number.

It is an amenable number.

625687816 is an abundant number, since it is smaller than the sum of its proper divisors (637720484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

625687816 is a wasteful number, since it uses less digits than its factorization.

625687816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016248 (or 6016244 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 625687816 is about 25013.7525373543. The cubic root of 625687816 is about 855.3014980388.

The spelling of 625687816 in words is "six hundred twenty-five million, six hundred eighty-seven thousand, eight hundred sixteen".