67680639 has 12 divisors (see below), whose sum is σ = 105281176. Its totient is φ = 41649552.

The previous prime is 67680637. The next prime is 67680647. The reversal of 67680639 is 93608676.

67680639 is a `hidden beast` number, since 6 + 7 + 6 + 8 + 0 + 639 = 666.

It is not a de Polignac number, because 67680639 - 2¹ = 67680637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67680594 and 67680603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67680631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289117 + ... + 289350.

Almost surely, 2^67680639 is an apocalyptic number.

67680639 is a deficient number, since it is larger than the sum of its proper divisors (37600537).

67680639 is a wasteful number, since it uses less digits than its factorization.

67680639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578486 (or 578483 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 67680639 is about 8226.8243569436. The cubic root of 67680639 is about 407.5255261464.

The spelling of 67680639 in words is "sixty-seven million, six hundred eighty thousand, six hundred thirty-nine".