64671767 has 2 divisors, whose sum is σ = 64671768. Its totient is φ = 64671766.

The previous prime is 64671731. The next prime is 64671781. The reversal of 64671767 is 76717646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64671767 - 2⁶ = 64671703 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64671707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32335883 + 32335884.

It is an arithmetic number, because the mean of its divisors is an integer number (32335884).

Almost surely, 2^64671767 is an apocalyptic number.

64671767 is a deficient number, since it is larger than the sum of its proper divisors (1).

64671767 is an equidigital number, since it uses as much as digits as its factorization.

64671767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 44.

The square root of 64671767 is about 8041.8758383850. The cubic root of 64671767 is about 401.3946463360.

The spelling of 64671767 in words is "sixty-four million, six hundred seventy-one thousand, seven hundred sixty-seven".