77064643 has 4 divisors (see below), whose sum is σ = 78856888. Its totient is φ = 75272400.

The previous prime is 77064623. The next prime is 77064653. The reversal of 77064643 is 34646077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34646077 = 5279 ⋅6563.

It is a cyclic number.

It is not a de Polignac number, because 77064643 - 2⁹ = 77064131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77064623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896058 + ... + 896143.

It is an arithmetic number, because the mean of its divisors is an integer number (19714222).

Almost surely, 2^77064643 is an apocalyptic number.

77064643 is a deficient number, since it is larger than the sum of its proper divisors (1792245).

77064643 is a wasteful number, since it uses less digits than its factorization.

77064643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792244.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 77064643 is about 8778.6469914219. The cubic root of 77064643 is about 425.5511060527.

The spelling of 77064643 in words is "seventy-seven million, sixty-four thousand, six hundred forty-three".