78001442 has 4 divisors (see below), whose sum is σ = 117002166. Its totient is φ = 39000720.

The previous prime is 78001421. The next prime is 78001499. The reversal of 78001442 is 24410087.

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., 49688401 + 28313041 = 7049^2 + 5321^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19500359 + ... + 19500362.

Almost surely, 2^78001442 is an apocalyptic number.

78001442 is a deficient number, since it is larger than the sum of its proper divisors (39000724).

78001442 is a wasteful number, since it uses less digits than its factorization.

78001442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39000723.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 78001442 is about 8831.8425031247. The cubic root of 78001442 is about 427.2685011338.

The spelling of 78001442 in words is "seventy-eight million, one thousand, four hundred forty-two".