67908640 has 24 divisors (see below), whose sum is σ = 160434540. Its totient is φ = 27163392.

The previous prime is 67908619. The next prime is 67908667. The reversal of 67908640 is 4680976.

It can be written as a sum of positive squares in 2 ways, for example, as 65869456 + 2039184 = 8116^2 + 1428^2 .

It is a super-2 number, since 2×67908640² = 9223166773299200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 67908593 and 67908602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212055 + ... + 212374.

Almost surely, 2^67908640 is an apocalyptic number.

It is an amenable number.

67908640 is an abundant number, since it is smaller than the sum of its proper divisors (92525900).

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

67908640 is a wasteful number, since it uses less digits than its factorization.

67908640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424444 (or 424436 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 67908640 is about 8240.6698756837. The cubic root of 67908640 is about 407.9826341449.

The spelling of 67908640 in words is "sixty-seven million, nine hundred eight thousand, six hundred forty".