77891063 has 4 divisors (see below), whose sum is σ = 78041088. Its totient is φ = 77741040.

The previous prime is 77891057. The next prime is 77891081. The reversal of 77891063 is 36019877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77891063 - 2⁸ = 77890807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77891063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77891053) 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, 74231 + ... + 75272.

It is an arithmetic number, because the mean of its divisors is an integer number (19510272).

Almost surely, 2^77891063 is an apocalyptic number.

77891063 is a deficient number, since it is larger than the sum of its proper divisors (150025).

77891063 is a wasteful number, since it uses less digits than its factorization.

77891063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150024.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 77891063 is about 8825.5913682880. The cubic root of 77891063 is about 427.0668649757.

The spelling of 77891063 in words is "seventy-seven million, eight hundred ninety-one thousand, sixty-three".