77216045 has 4 divisors (see below), whose sum is σ = 92659260. Its totient is φ = 61772832.

The previous prime is 77216039. The next prime is 77216047. The reversal of 77216045 is 54061277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54061277 = 43 ⋅1257239.

It can be written as a sum of positive squares in 2 ways, for example, as 19166884 + 58049161 = 4378^2 + 7619^2 .

It is a cyclic number.

It is not a de Polignac number, because 77216045 - 2¹⁸ = 76953901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77216047) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7721600 + ... + 7721609.

It is an arithmetic number, because the mean of its divisors is an integer number (23164815).

Almost surely, 2^77216045 is an apocalyptic number.

It is an amenable number.

77216045 is a deficient number, since it is larger than the sum of its proper divisors (15443215).

77216045 is a wasteful number, since it uses less digits than its factorization.

77216045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15443214.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 77216045 is about 8787.2660708550. The cubic root of 77216045 is about 425.8296044632.

The spelling of 77216045 in words is "seventy-seven million, two hundred sixteen thousand, forty-five".