77729645 has 16 divisors (see below), whose sum is σ = 109202688. Its totient is φ = 51999360.

The previous prime is 77729633. The next prime is 77729653. The reversal of 77729645 is 54692777.

It is not a de Polignac number, because 77729645 - 2¹⁰ = 77728621 is a prime.

It is a super-3 number, since 3×77729645³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77729645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25649 + ... + 28518.

It is an arithmetic number, because the mean of its divisors is an integer number (6825168).

Almost surely, 2^77729645 is an apocalyptic number.

It is an amenable number.

77729645 is a deficient number, since it is larger than the sum of its proper divisors (31473043).

77729645 is a wasteful number, since it uses less digits than its factorization.

77729645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54220.

The product of its digits is 740880, while the sum is 47.

The square root of 77729645 is about 8816.4417425626. The cubic root of 77729645 is about 426.7716494459.

The spelling of 77729645 in words is "seventy-seven million, seven hundred twenty-nine thousand, six hundred forty-five".