687849420 has 96 divisors (see below), whose sum is σ = 1985872896. Its totient is φ = 177811200.

The previous prime is 687849401. The next prime is 687849433. The reversal of 687849420 is 24948786.

It is a self number, because there is not a number n which added to its sum of digits gives 687849420.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258537 + ... + 261183.

It is an arithmetic number, because the mean of its divisors is an integer number (20686176).

Almost surely, 2^687849420 is an apocalyptic number.

687849420 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 687849420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992936448).

687849420 is an abundant number, since it is smaller than the sum of its proper divisors (1298023476).

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

687849420 is a wasteful number, since it uses less digits than its factorization.

687849420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 687849420 is about 26226.8835357920. The cubic root of 687849420 is about 882.7365826664.

The spelling of 687849420 in words is "six hundred eighty-seven million, eight hundred forty-nine thousand, four hundred twenty".