67609979 has 2 divisors, whose sum is σ = 67609980. Its totient is φ = 67609978.

The previous prime is 67609973. The next prime is 67610083. The reversal of 67609979 is 97990676.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67609979 - 2¹² = 67605883 is a prime.

It is a super-2 number, since 2×67609979² = 9142218520760882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67609979.

It is not a weakly prime, because it can be changed into another prime (67609973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33804989 + 33804990.

It is an arithmetic number, because the mean of its divisors is an integer number (33804990).

Almost surely, 2^67609979 is an apocalyptic number.

67609979 is a deficient number, since it is larger than the sum of its proper divisors (1).

67609979 is an equidigital number, since it uses as much as digits as its factorization.

67609979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1285956, while the sum is 53.

The square root of 67609979 is about 8222.5287472894. The cubic root of 67609979 is about 407.3836550439.

The spelling of 67609979 in words is "sixty-seven million, six hundred nine thousand, nine hundred seventy-nine".