67620857 has 2 divisors, whose sum is σ = 67620858. Its totient is φ = 67620856.

The previous prime is 67620823. The next prime is 67620911. The reversal of 67620857 is 75802676.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 3444736 = 8011^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 67620857 - 2¹⁰ = 67619833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67622857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33810428 + 33810429.

It is an arithmetic number, because the mean of its divisors is an integer number (33810429).

Almost surely, 2^67620857 is an apocalyptic number.

It is an amenable number.

67620857 is a deficient number, since it is larger than the sum of its proper divisors (1).

67620857 is an equidigital number, since it uses as much as digits as its factorization.

67620857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 67620857 is about 8223.1901960249. The cubic root of 67620857 is about 407.4055023205.

The spelling of 67620857 in words is "sixty-seven million, six hundred twenty thousand, eight hundred fifty-seven".