78424498 has 4 divisors (see below), whose sum is σ = 117636750. Its totient is φ = 39212248.

The previous prime is 78424487. The next prime is 78424499. The reversal of 78424498 is 89442487.

It is a happy number.

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., 41177889 + 37246609 = 6417^2 + 6103^2 .

It is not an unprimeable number, because it can be changed into a prime (78424499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19606123 + ... + 19606126.

Almost surely, 2^78424498 is an apocalyptic number.

78424498 is a deficient number, since it is larger than the sum of its proper divisors (39212252).

78424498 is a wasteful number, since it uses less digits than its factorization.

78424498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39212251.

The product of its digits is 516096, while the sum is 46.

The square root of 78424498 is about 8855.7607239582. The cubic root of 78424498 is about 428.0395667558.

The spelling of 78424498 in words is "seventy-eight million, four hundred twenty-four thousand, four hundred ninety-eight".