78768955 has 4 divisors (see below), whose sum is σ = 94522752. Its totient is φ = 63015160.

The previous prime is 78768917. The next prime is 78768961. The reversal of 78768955 is 55986787.

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

It is not a de Polignac number, because 78768955 - 2¹⁹ = 78244667 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78768896 and 78768905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7876891 + ... + 7876900.

It is an arithmetic number, because the mean of its divisors is an integer number (23630688).

Almost surely, 2^78768955 is an apocalyptic number.

78768955 is a deficient number, since it is larger than the sum of its proper divisors (15753797).

78768955 is a wasteful number, since it uses less digits than its factorization.

78768955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15753796.

The product of its digits is 4233600, while the sum is 55.

The square root of 78768955 is about 8875.1876036510. The cubic root of 78768955 is about 428.6653316194.

The spelling of 78768955 in words is "seventy-eight million, seven hundred sixty-eight thousand, nine hundred fifty-five".