688055820 has 48 divisors (see below), whose sum is σ = 1934095968. Its totient is φ = 182763520.

The previous prime is 688055801. The next prime is 688055821. The reversal of 688055820 is 28550886.

It is a super-2 number, since 2×688055820² = 946841622871744800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688055821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6891 + ... + 37730.

It is an arithmetic number, because the mean of its divisors is an integer number (40293666).

Almost surely, 2^688055820 is an apocalyptic number.

688055820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688055820 is an abundant number, since it is smaller than the sum of its proper divisors (1246040148).

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

688055820 is a wasteful number, since it uses less digits than its factorization.

688055820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44890 (or 44888 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 688055820 is about 26230.8181344006. The cubic root of 688055820 is about 882.8248668192.

The spelling of 688055820 in words is "six hundred eighty-eight million, fifty-five thousand, eight hundred twenty".