687420544 has 32 divisors (see below), whose sum is σ = 1383055740. Its totient is φ = 340300800.

The previous prime is 687420511. The next prime is 687420563. The reversal of 687420544 is 445024786.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 610682944 + 76737600 = 24712^2 + 8760^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 687420497 and 687420506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13659 + ... + 39514.

Almost surely, 2^687420544 is an apocalyptic number.

687420544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

687420544 is an abundant number, since it is smaller than the sum of its proper divisors (695635196).

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

687420544 is a wasteful number, since it uses less digits than its factorization.

687420544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53288 (or 53276 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The square root of 687420544 is about 26218.7059940036. The cubic root of 687420544 is about 882.5530816298.

The spelling of 687420544 in words is "six hundred eighty-seven million, four hundred twenty thousand, five hundred forty-four".