67921720 has 16 divisors (see below), whose sum is σ = 152823960. Its totient is φ = 27168672.

The previous prime is 67921717. The next prime is 67921747. The reversal of 67921720 is 2712976.

It is a super-2 number, since 2×67921720² = 9226720095516800, which contains 22 as substring.

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, 848982 + ... + 849061.

Almost surely, 2^67921720 is an apocalyptic number.

It is an amenable number.

67921720 is an abundant number, since it is smaller than the sum of its proper divisors (84902240).

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

67921720 is a wasteful number, since it uses less digits than its factorization.

67921720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698054 (or 1698050 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 67921720 is about 8241.4634622742. The cubic root of 67921720 is about 408.0088265424.

The spelling of 67921720 in words is "sixty-seven million, nine hundred twenty-one thousand, seven hundred twenty".