67861649 has 2 divisors, whose sum is σ = 67861650. Its totient is φ = 67861648.

The previous prime is 67861583. The next prime is 67861657. The reversal of 67861649 is 94616876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 18861649 = 7000^2 + 4343^2 .

It is a cyclic number.

It is not a de Polignac number, because 67861649 - 2⁸ = 67861393 is a prime.

It is not a weakly prime, because it can be changed into another prime (67861669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33930824 + 33930825.

It is an arithmetic number, because the mean of its divisors is an integer number (33930825).

Almost surely, 2^67861649 is an apocalyptic number.

It is an amenable number.

67861649 is a deficient number, since it is larger than the sum of its proper divisors (1).

67861649 is an equidigital number, since it uses as much as digits as its factorization.

67861649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 67861649 is about 8237.8182184362. The cubic root of 67861649 is about 407.8885079987. Note that the first 3 decimals are identical.

The spelling of 67861649 in words is "sixty-seven million, eight hundred sixty-one thousand, six hundred forty-nine".