78445742 has 4 divisors (see below), whose sum is σ = 117668616. Its totient is φ = 39222870.

The previous prime is 78445733. The next prime is 78445753. The reversal of 78445742 is 24754487.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78445742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19611434 + ... + 19611437.

It is an arithmetic number, because the mean of its divisors is an integer number (29417154).

Almost surely, 2^78445742 is an apocalyptic number.

78445742 is a deficient number, since it is larger than the sum of its proper divisors (39222874).

78445742 is a wasteful number, since it uses less digits than its factorization.

78445742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39222873.

The product of its digits is 250880, while the sum is 41.

The square root of 78445742 is about 8856.9600879760. The cubic root of 78445742 is about 428.0782130625.

The spelling of 78445742 in words is "seventy-eight million, four hundred forty-five thousand, seven hundred forty-two".