687620444 has 12 divisors (see below), whose sum is σ = 1375240944. Its totient is φ = 294694464.

The previous prime is 687620429. The next prime is 687620449. The reversal of 687620444 is 444026786.

687620444 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687620449) 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, 12278909 + ... + 12278964.

It is an arithmetic number, because the mean of its divisors is an integer number (114603412).

Almost surely, 2^687620444 is an apocalyptic number.

It is an amenable number.

687620444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

687620444 is a wasteful number, since it uses less digits than its factorization.

687620444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24557884 (or 24557882 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 41.

The square root of 687620444 is about 26222.5178806308. The cubic root of 687620444 is about 882.6386213402.

The spelling of 687620444 in words is "six hundred eighty-seven million, six hundred twenty thousand, four hundred forty-four".