78855494 has 4 divisors (see below), whose sum is σ = 118283244. Its totient is φ = 39427746.

The previous prime is 78855457. The next prime is 78855499. The reversal of 78855494 is 49455887.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19713872 + ... + 19713875.

It is an arithmetic number, because the mean of its divisors is an integer number (29570811).

Almost surely, 2^78855494 is an apocalyptic number.

78855494 is a deficient number, since it is larger than the sum of its proper divisors (39427750).

78855494 is a wasteful number, since it uses less digits than its factorization.

78855494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39427749.

The product of its digits is 1612800, while the sum is 50.

The square root of 78855494 is about 8880.0615988854. The cubic root of 78855494 is about 428.8222576242.

The spelling of 78855494 in words is "seventy-eight million, eight hundred fifty-five thousand, four hundred ninety-four".