686489190 has 128 divisors (see below), whose sum is σ = 1788480000. Its totient is φ = 168109056.

The previous prime is 686489179. The next prime is 686489201. The reversal of 686489190 is 91984686.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (686489179) and next prime (686489201).

It is a super-2 number, since 2×686489190² = 942534815973712200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4607236 + ... + 4607384.

It is an arithmetic number, because the mean of its divisors is an integer number (13972500).

Almost surely, 2^686489190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686489190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894240000).

686489190 is an abundant number, since it is smaller than the sum of its proper divisors (1101990810).

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

686489190 is a wasteful number, since it uses less digits than its factorization.

686489190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 686489190 is about 26200.9387236412. The cubic root of 686489190 is about 882.1543248350.

The spelling of 686489190 in words is "six hundred eighty-six million, four hundred eighty-nine thousand, one hundred ninety".