67720820 has 12 divisors (see below), whose sum is σ = 142213764. Its totient is φ = 27088320.

The previous prime is 67720811. The next prime is 67720831. The reversal of 67720820 is 2802776.

It can be written as a sum of positive squares in 2 ways, for example, as 53553124 + 14167696 = 7318^2 + 3764^2 .

It is a super-2 number, since 2×67720820² = 9172218922944800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1693001 + ... + 1693040.

It is an arithmetic number, because the mean of its divisors is an integer number (11851147).

Almost surely, 2^67720820 is an apocalyptic number.

It is an amenable number.

67720820 is an abundant number, since it is smaller than the sum of its proper divisors (74492944).

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

67720820 is a wasteful number, since it uses less digits than its factorization.

67720820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386050 (or 3386048 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 67720820 is about 8229.2660669102. The cubic root of 67720820 is about 407.6061574957.

The spelling of 67720820 in words is "sixty-seven million, seven hundred twenty thousand, eight hundred twenty".