686622378 has 32 divisors (see below), whose sum is σ = 1499150016. Its totient is φ = 208372608.

The previous prime is 686622371. The next prime is 686622403. The reversal of 686622378 is 873226686.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (686622371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54600 + ... + 65987.

It is an arithmetic number, because the mean of its divisors is an integer number (46848438).

Almost surely, 2^686622378 is an apocalyptic number.

686622378 is an abundant number, since it is smaller than the sum of its proper divisors (812527638).

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

686622378 is a wasteful number, since it uses less digits than its factorization.

686622378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120678.

The product of its digits is 1161216, while the sum is 48.

The square root of 686622378 is about 26203.4802650335. The cubic root of 686622378 is about 882.2113710222.

The spelling of 686622378 in words is "six hundred eighty-six million, six hundred twenty-two thousand, three hundred seventy-eight".