78841655 has 4 divisors (see below), whose sum is σ = 94609992. Its totient is φ = 63073320.

The previous prime is 78841643. The next prime is 78841657. The reversal of 78841655 is 55614887.

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: 55614887 = 881 ⋅63127.

It is not a de Polignac number, because 78841655 - 2¹⁶ = 78776119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78841657) 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, 7884161 + ... + 7884170.

It is an arithmetic number, because the mean of its divisors is an integer number (23652498).

Almost surely, 2^78841655 is an apocalyptic number.

78841655 is a deficient number, since it is larger than the sum of its proper divisors (15768337).

78841655 is a wasteful number, since it uses less digits than its factorization.

78841655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15768336.

The product of its digits is 268800, while the sum is 44.

The square root of 78841655 is about 8879.2823471269. The cubic root of 78841655 is about 428.7971703068.

The spelling of 78841655 in words is "seventy-eight million, eight hundred forty-one thousand, six hundred fifty-five".