78273971 has 4 divisors (see below), whose sum is σ = 78311112. Its totient is φ = 78236832.

The previous prime is 78273959. The next prime is 78273973. The reversal of 78273971 is 17937287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78273971 - 2¹⁴ = 78257587 is a prime.

It is a super-2 number, since 2×78273971² = 12253629072217682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78273973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15206 + ... + 19691.

It is an arithmetic number, because the mean of its divisors is an integer number (19577778).

Almost surely, 2^78273971 is an apocalyptic number.

78273971 is a deficient number, since it is larger than the sum of its proper divisors (37141).

78273971 is a wasteful number, since it uses less digits than its factorization.

78273971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37140.

The product of its digits is 148176, while the sum is 44.

The square root of 78273971 is about 8847.2578237553. The cubic root of 78273971 is about 427.7655334264.

The spelling of 78273971 in words is "seventy-eight million, two hundred seventy-three thousand, nine hundred seventy-one".