78040142 has 4 divisors (see below), whose sum is σ = 117060216. Its totient is φ = 39020070.

The previous prime is 78040121. The next prime is 78040153. The reversal of 78040142 is 24104087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24104087 = 7 ⋅3443441.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 19510034 + ... + 19510037.

It is an arithmetic number, because the mean of its divisors is an integer number (29265054).

Almost surely, 2^78040142 is an apocalyptic number.

78040142 is a deficient number, since it is larger than the sum of its proper divisors (39020074).

78040142 is a wasteful number, since it uses less digits than its factorization.

78040142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39020073.

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

The square root of 78040142 is about 8834.0331672459. The cubic root of 78040142 is about 427.3391517812.

The spelling of 78040142 in words is "seventy-eight million, forty thousand, one hundred forty-two".