77649805 has 8 divisors (see below), whose sum is σ = 93279744. Its totient is φ = 62053200.

The previous prime is 77649797. The next prime is 77649853. The reversal of 77649805 is 50894677.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77649805 - 2³ = 77649797 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 2881 + ... + 12790.

It is an arithmetic number, because the mean of its divisors is an integer number (11659968).

Almost surely, 2^77649805 is an apocalyptic number.

It is an amenable number.

77649805 is a deficient number, since it is larger than the sum of its proper divisors (15629939).

77649805 is a wasteful number, since it uses less digits than its factorization.

77649805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 77649805 is about 8811.9126754638. The cubic root of 77649805 is about 426.6254798975.

The spelling of 77649805 in words is "seventy-seven million, six hundred forty-nine thousand, eight hundred five".