78500042 has 8 divisors (see below), whose sum is σ = 121810500. Its totient is φ = 37896544.

The previous prime is 78500027. The next prime is 78500053. The reversal of 78500042 is 24000587.

It can be written as a sum of positive squares in 2 ways, for example, as 77457601 + 1042441 = 8801^2 + 1021^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 78499984 and 78500020.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 676667 + ... + 676782.

Almost surely, 2^78500042 is an apocalyptic number.

78500042 is a deficient number, since it is larger than the sum of its proper divisors (43310458).

78500042 is a wasteful number, since it uses less digits than its factorization.

78500042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353480.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 78500042 is about 8860.0249435315. The cubic root of 78500042 is about 428.1769619350.

The spelling of 78500042 in words is "seventy-eight million, five hundred thousand, forty-two".