687424626 has 72 divisors (see below), whose sum is σ = 1745544060. Its totient is φ = 194939136.

The previous prime is 687424607. The next prime is 687424649. The reversal of 687424626 is 626424786.

It can be written as a sum of positive squares in 2 ways, for example, as 615089601 + 72335025 = 24801^2 + 8505^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 117990 + ... + 123678.

Almost surely, 2^687424626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687424626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872772030).

687424626 is an abundant number, since it is smaller than the sum of its proper divisors (1058119434).

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

687424626 is a wasteful number, since it uses less digits than its factorization.

687424626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5848 (or 5838 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 687424626 is about 26218.7838390723. The cubic root of 687424626 is about 882.5548285345.

The spelling of 687424626 in words is "six hundred eighty-seven million, four hundred twenty-four thousand, six hundred twenty-six".