67639039920 has 480 divisors, whose sum is σ = 239949552960. Its totient is φ = 17056604160.

The previous prime is 67639039877. The next prime is 67639039931. The reversal of 67639039920 is 2993093676.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 173879086 + ... + 173879474.

It is an arithmetic number, because the mean of its divisors is an integer number (499894902).

Almost surely, 2^67639039920 is an apocalyptic number.

67639039920 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 67639039920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119974776480).

67639039920 is an abundant number, since it is smaller than the sum of its proper divisors (172310513040).

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

67639039920 is a wasteful number, since it uses less digits than its factorization.

67639039920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 54.

The spelling of 67639039920 in words is "sixty-seven billion, six hundred thirty-nine million, thirty-nine thousand, nine hundred twenty".