687071220 has 96 divisors (see below), whose sum is σ = 2103252480. Its totient is φ = 166200960.

The previous prime is 687071213. The next prime is 687071227. The reversal of 687071220 is 22170786.

It is an interprime number because it is at equal distance from previous prime (687071213) and next prime (687071227).

It is a super-2 number, since 2×687071220² = 944133722704576800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687071227) 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, 423571 + ... + 425189.

It is an arithmetic number, because the mean of its divisors is an integer number (21908880).

Almost surely, 2^687071220 is an apocalyptic number.

687071220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687071220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051626240).

687071220 is an abundant number, since it is smaller than the sum of its proper divisors (1416181260).

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

687071220 is a wasteful number, since it uses less digits than its factorization.

687071220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 687071220 is about 26212.0434151937. The cubic root of 687071220 is about 882.4035617024.

The spelling of 687071220 in words is "six hundred eighty-seven million, seventy-one thousand, two hundred twenty".