78911914 has 4 divisors (see below), whose sum is σ = 118367874. Its totient is φ = 39455956.

The previous prime is 78911893. The next prime is 78911927. The reversal of 78911914 is 41911987.

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

It can be written as a sum of positive squares in only one way, i.e., 78907689 + 4225 = 8883^2 + 65^2 .

It is a super-2 number, since 2×78911914² = 12454180342286792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19727977 + ... + 19727980.

Almost surely, 2^78911914 is an apocalyptic number.

78911914 is a deficient number, since it is larger than the sum of its proper divisors (39455960).

78911914 is a wasteful number, since it uses less digits than its factorization.

78911914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39455959.

The product of its digits is 18144, while the sum is 40.

The square root of 78911914 is about 8883.2378106184. The cubic root of 78911914 is about 428.9245053462.

The spelling of 78911914 in words is "seventy-eight million, nine hundred eleven thousand, nine hundred fourteen".