67720043520 has 440 divisors, whose sum is σ = 243949898544. Its totient is φ = 17963679744.

The previous prime is 67720043497. The next prime is 67720043543. The reversal of 67720043520 is 2534002776.

It is a happy number.

67720043520 is a `hidden beast` number, since 6 + 77 + 20 + 0 + 43 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (67720043497) and next prime (67720043543).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 117365472 + ... + 117366048.

Almost surely, 2^67720043520 is an apocalyptic number.

67720043520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67720043520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121974949272).

67720043520 is an abundant number, since it is smaller than the sum of its proper divisors (176229855024).

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

67720043520 is a wasteful number, since it uses less digits than its factorization.

67720043520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The spelling of 67720043520 in words is "sixty-seven billion, seven hundred twenty million, forty-three thousand, five hundred twenty".