681622020 has 96 divisors (see below), whose sum is σ = 2212842240. Its totient is φ = 173859840.

The previous prime is 681622001. The next prime is 681622027. The reversal of 681622020 is 20226186.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (681622027) 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, 15021 + ... + 39860.

It is an arithmetic number, because the mean of its divisors is an integer number (23050440).

Almost surely, 2^681622020 is an apocalyptic number.

681622020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681622020 is an abundant number, since it is smaller than the sum of its proper divisors (1531220220).

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

681622020 is a wasteful number, since it uses less digits than its factorization.

681622020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54922 (or 54914 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 681622020 is about 26107.8919103018. The cubic root of 681622020 is about 880.0645699866.

The spelling of 681622020 in words is "six hundred eighty-one million, six hundred twenty-two thousand, twenty".