687268026 has 12 divisors (see below), whose sum is σ = 1489080762. Its totient is φ = 229089336.

The previous prime is 687268009. The next prime is 687268031. The reversal of 687268026 is 620862786.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 661775625 + 25492401 = 25725^2 + 5049^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19090761 + ... + 19090796.

Almost surely, 2^687268026 is an apocalyptic number.

687268026 is an abundant number, since it is smaller than the sum of its proper divisors (801812736).

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

687268026 is a wasteful number, since it uses less digits than its factorization.

687268026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38181565 (or 38181562 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 687268026 is about 26215.7972604306. The cubic root of 687268026 is about 882.4878061162.

The spelling of 687268026 in words is "six hundred eighty-seven million, two hundred sixty-eight thousand, twenty-six".