78420041 has 24 divisors (see below), whose sum is σ = 96033600. Its totient is φ = 63726432.

The previous prime is 78420037. The next prime is 78420053. The reversal of 78420041 is 14002487.

It is not a de Polignac number, because 78420041 - 2² = 78420037 is a prime.

It is a super-2 number, since 2×78420041² = 12299405660883362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78420841) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 167690 + ... + 168156.

It is an arithmetic number, because the mean of its divisors is an integer number (4001400).

Almost surely, 2^78420041 is an apocalyptic number.

It is an amenable number.

78420041 is a deficient number, since it is larger than the sum of its proper divisors (17613559).

78420041 is a wasteful number, since it uses less digits than its factorization.

78420041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 646 counting only the distinct ones).

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

The square root of 78420041 is about 8855.5090762756. The cubic root of 78420041 is about 428.0314578590.

The spelling of 78420041 in words is "seventy-eight million, four hundred twenty thousand, forty-one".