78919895 has 4 divisors (see below), whose sum is σ = 94703880. Its totient is φ = 63135912.

The previous prime is 78919889. The next prime is 78919937. The reversal of 78919895 is 59891987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59891987 = 3527 ⋅16981.

It is a cyclic number.

It is not a de Polignac number, because 78919895 - 2¹⁰ = 78918871 is a prime.

It is a super-2 number, since 2×78919895² = 12456699653622050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78919895.

It is a congruent number.

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, 7891985 + ... + 7891994.

It is an arithmetic number, because the mean of its divisors is an integer number (23675970).

Almost surely, 2^78919895 is an apocalyptic number.

78919895 is a deficient number, since it is larger than the sum of its proper divisors (15783985).

78919895 is a wasteful number, since it uses less digits than its factorization.

78919895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15783984.

The product of its digits is 1632960, while the sum is 56.

The square root of 78919895 is about 8883.6870160987. The cubic root of 78919895 is about 428.9389650600.

The spelling of 78919895 in words is "seventy-eight million, nine hundred nineteen thousand, eight hundred ninety-five".