77816845 has 8 divisors (see below), whose sum is σ = 93636864. Its totient is φ = 62082384.

The previous prime is 77816807. The next prime is 77816863. The reversal of 77816845 is 54861877.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77816845 is a prime.

It is a super-2 number, since 2×77816845² = 12110922731508050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77816795 and 77816804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19369 + ... + 23038.

It is an arithmetic number, because the mean of its divisors is an integer number (11704608).

Almost surely, 2^77816845 is an apocalyptic number.

It is an amenable number.

77816845 is a deficient number, since it is larger than the sum of its proper divisors (15820019).

77816845 is a wasteful number, since it uses less digits than its factorization.

77816845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42779.

The product of its digits is 376320, while the sum is 46.

The square root of 77816845 is about 8821.3856621281. The cubic root of 77816845 is about 426.9311792294.

The spelling of 77816845 in words is "seventy-seven million, eight hundred sixteen thousand, eight hundred forty-five".