687967578 has 48 divisors (see below), whose sum is σ = 1543782240. Its totient is φ = 221270112.

The previous prime is 687967571. The next prime is 687967583. The reversal of 687967578 is 875769786.

It is not an unprimeable number, because it can be changed into a prime (687967571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58888 + ... + 69596.

It is an arithmetic number, because the mean of its divisors is an integer number (32162130).

Almost surely, 2^687967578 is an apocalyptic number.

687967578 is an abundant number, since it is smaller than the sum of its proper divisors (855814662).

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

687967578 is a wasteful number, since it uses less digits than its factorization.

687967578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10843 (or 10840 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The square root of 687967578 is about 26229.1360513456. The cubic root of 687967578 is about 882.7871249383.

The spelling of 687967578 in words is "six hundred eighty-seven million, nine hundred sixty-seven thousand, five hundred seventy-eight".