78748442 has 4 divisors (see below), whose sum is σ = 118122666. Its totient is φ = 39374220.

The previous prime is 78748409. The next prime is 78748447. The reversal of 78748442 is 24484787.

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., 72403081 + 6345361 = 8509^2 + 2519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78748393 and 78748402.

It is not an unprimeable number, because it can be changed into a prime (78748447) 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, 19687109 + ... + 19687112.

Almost surely, 2^78748442 is an apocalyptic number.

78748442 is a deficient number, since it is larger than the sum of its proper divisors (39374224).

78748442 is a wasteful number, since it uses less digits than its factorization.

78748442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39374223.

The product of its digits is 401408, while the sum is 44.

The square root of 78748442 is about 8874.0318908600. The cubic root of 78748442 is about 428.6281174007.

The spelling of 78748442 in words is "seventy-eight million, seven hundred forty-eight thousand, four hundred forty-two".