77783854 has 4 divisors (see below), whose sum is σ = 116675784. Its totient is φ = 38891926.

The previous prime is 77783819. The next prime is 77783869. The reversal of 77783854 is 45838777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45838777 = 257 ⋅178361.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 77783798 and 77783807.

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 as a sum of consecutive naturals, namely, 19445962 + ... + 19445965.

It is an arithmetic number, because the mean of its divisors is an integer number (29168946).

Almost surely, 2^77783854 is an apocalyptic number.

77783854 is a deficient number, since it is larger than the sum of its proper divisors (38891930).

77783854 is a wasteful number, since it uses less digits than its factorization.

77783854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38891929.

The product of its digits is 1317120, while the sum is 49.

The square root of 77783854 is about 8819.5155195736. The cubic root of 77783854 is about 426.8708372067.

The spelling of 77783854 in words is "seventy-seven million, seven hundred eighty-three thousand, eight hundred fifty-four".