67520977920 has 1320 divisors, whose sum is σ = 285371090928. Its totient is φ = 15128985600.

The previous prime is 67520977877. The next prime is 67520977921. The reversal of 67520977920 is 2977902576.

67520977920 is a `hidden beast` number, since 6 + 7 + 520 + 97 + 7 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1320).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67520977921) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1646853100 + ... + 1646853140.

Almost surely, 2^67520977920 is an apocalyptic number.

67520977920 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 67520977920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142685545464).

67520977920 is an abundant number, since it is smaller than the sum of its proper divisors (217850113008).

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

67520977920 is a wasteful number, since it uses less digits than its factorization.

67520977920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The spelling of 67520977920 in words is "sixty-seven billion, five hundred twenty million, nine hundred seventy-seven thousand, nine hundred twenty".