686811820030 has 64 divisors (see below), whose sum is σ = 1427180083200. Its totient is φ = 233094384000.

The previous prime is 686811820027. The next prime is 686811820033. The reversal of 686811820030 is 30028118686.

It is an interprime number because it is at equal distance from previous prime (686811820027) and next prime (686811820033).

It is a super-2 number, since 2×686811820030² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686811820033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43819095 + ... + 43834765.

It is an arithmetic number, because the mean of its divisors is an integer number (22299688800).

Almost surely, 2^686811820030 is an apocalyptic number.

686811820030 is an abundant number, since it is smaller than the sum of its proper divisors (740368263170).

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

686811820030 is a wasteful number, since it uses less digits than its factorization.

686811820030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21985.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 686811820030 in words is "six hundred eighty-six billion, eight hundred eleven million, eight hundred twenty thousand, thirty".