77827863 has 4 divisors (see below), whose sum is σ = 103770488. Its totient is φ = 51885240.

The previous prime is 77827843. The next prime is 77827879. The reversal of 77827863 is 36872877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36872877 = 3 ⋅12290959.

It is not a de Polignac number, because 77827863 - 2¹⁶ = 77762327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77827823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12971308 + ... + 12971313.

It is an arithmetic number, because the mean of its divisors is an integer number (25942622).

Almost surely, 2^77827863 is an apocalyptic number.

77827863 is a deficient number, since it is larger than the sum of its proper divisors (25942625).

77827863 is a wasteful number, since it uses less digits than its factorization.

77827863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25942624.

The product of its digits is 790272, while the sum is 48.

The square root of 77827863 is about 8822.0101450860. The cubic root of 77827863 is about 426.9513278477.

The spelling of 77827863 in words is "seventy-seven million, eight hundred twenty-seven thousand, eight hundred sixty-three".