67399620864 has 72 divisors (see below), whose sum is σ = 179725338912. Its totient is φ = 22423449600.

The previous prime is 67399620857. The next prime is 67399620881. The reversal of 67399620864 is 46802699376.

It is a super-2 number, since 2×67399620864² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67399620798 and 67399620807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317764 + ... + 485564.

Almost surely, 2^67399620864 is an apocalyptic number.

67399620864 is a gapful number since it is divisible by the number (64) 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 67399620864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89862669456).

67399620864 is an abundant number, since it is smaller than the sum of its proper divisors (112325718048).

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

67399620864 is a wasteful number, since it uses less digits than its factorization.

67399620864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168343 (or 168329 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 67399620864 in words is "sixty-seven billion, three hundred ninety-nine million, six hundred twenty thousand, eight hundred sixty-four".