78771923 has 4 divisors (see below), whose sum is σ = 80063328. Its totient is φ = 77480520.

The previous prime is 78771907. The next prime is 78771943. The reversal of 78771923 is 32917787.

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 78771923 - 2⁴ = 78771907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78771943) 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, 645611 + ... + 645732.

It is an arithmetic number, because the mean of its divisors is an integer number (20015832).

Almost surely, 2^78771923 is an apocalyptic number.

78771923 is a deficient number, since it is larger than the sum of its proper divisors (1291405).

78771923 is a wasteful number, since it uses less digits than its factorization.

78771923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291404.

The product of its digits is 148176, while the sum is 44.

The square root of 78771923 is about 8875.3548098090. The cubic root of 78771923 is about 428.6707155626.

The spelling of 78771923 in words is "seventy-eight million, seven hundred seventy-one thousand, nine hundred twenty-three".