78020842 has 8 divisors (see below), whose sum is σ = 117098532. Its totient is φ = 38988000.

The previous prime is 78020797. The next prime is 78020879. The reversal of 78020842 is 24802087.

It can be written as a sum of positive squares in 2 ways, for example, as 75707401 + 2313441 = 8701^2 + 1521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×78020842³ (a number of 25 digits) contains 333 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 6459 + ... + 14062.

Almost surely, 2^78020842 is an apocalyptic number.

78020842 is a deficient number, since it is larger than the sum of its proper divisors (39077690).

78020842 is a wasteful number, since it uses less digits than its factorization.

78020842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22424.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 78020842 is about 8832.9407334138. The cubic root of 78020842 is about 427.3039206577.

The spelling of 78020842 in words is "seventy-eight million, twenty thousand, eight hundred forty-two".