78273829 has 4 divisors (see below), whose sum is σ = 78556684. Its totient is φ = 77990976.

The previous prime is 78273827. The next prime is 78273841. The reversal of 78273829 is 92837287.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30636225 + 47637604 = 5535^2 + 6902^2 .

It is a cyclic number.

It is not a de Polignac number, because 78273829 - 2¹ = 78273827 is a prime.

It is a super-2 number, since 2×78273829² = 12253584612642482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78273821) by changing a digit.

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, 141012 + ... + 141565.

It is an arithmetic number, because the mean of its divisors is an integer number (19639171).

Almost surely, 2^78273829 is an apocalyptic number.

It is an amenable number.

78273829 is a deficient number, since it is larger than the sum of its proper divisors (282855).

78273829 is a wasteful number, since it uses less digits than its factorization.

78273829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282854.

The product of its digits is 338688, while the sum is 46.

The square root of 78273829 is about 8847.2497986662. The cubic root of 78273829 is about 427.7652747506.

The spelling of 78273829 in words is "seventy-eight million, two hundred seventy-three thousand, eight hundred twenty-nine".