67628691 has 48 divisors (see below), whose sum is σ = 109156320. Its totient is φ = 40089600.

The previous prime is 67628681. The next prime is 67628699. The reversal of 67628691 is 19682676.

It is not a de Polignac number, because 67628691 - 2⁹ = 67628179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67628699) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 669541 + ... + 669641.

It is an arithmetic number, because the mean of its divisors is an integer number (2274090).

Almost surely, 2^67628691 is an apocalyptic number.

67628691 is a deficient number, since it is larger than the sum of its proper divisors (41527629).

67628691 is a wasteful number, since it uses less digits than its factorization.

67628691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 273 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 67628691 is about 8223.6665180441. Note that the first 3 decimals coincide. The cubic root of 67628691 is about 407.4212346040.

The spelling of 67628691 in words is "sixty-seven million, six hundred twenty-eight thousand, six hundred ninety-one".