67820520 has 32 divisors (see below), whose sum is σ = 203461920. Its totient is φ = 18085440.

The previous prime is 67820513. The next prime is 67820521. The reversal of 67820520 is 2502876.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (67820521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282466 + ... + 282705.

It is an arithmetic number, because the mean of its divisors is an integer number (6358185).

Almost surely, 2^67820520 is an apocalyptic number.

67820520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67820520 is an abundant number, since it is smaller than the sum of its proper divisors (135641400).

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

67820520 is a wasteful number, since it uses less digits than its factorization.

67820520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565185 (or 565181 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 67820520 is about 8235.3214873495. The cubic root of 67820520 is about 407.8060881686.

The spelling of 67820520 in words is "sixty-seven million, eight hundred twenty thousand, five hundred twenty".