78234133 has 4 divisors (see below), whose sum is σ = 78254560. Its totient is φ = 78213708.

The previous prime is 78234131. The next prime is 78234137. The reversal of 78234133 is 33143287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a 3-Lehmer number, since φ(78234133) divides (78234133-1)³.

It is a cyclic number.

It is not a de Polignac number, because 78234133 - 2¹ = 78234131 is a prime.

It is a super-2 number, since 2×78234133² = 12241159132523378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78234095 and 78234104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78234131) 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 3 ways as a sum of consecutive naturals, for example, 2553 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (19563640).

Almost surely, 2^78234133 is an apocalyptic number.

78234133 is the 5107-th octagonal number.

It is an amenable number.

78234133 is a deficient number, since it is larger than the sum of its proper divisors (20427).

78234133 is a wasteful number, since it uses less digits than its factorization.

78234133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20426.

The product of its digits is 12096, while the sum is 31.

The square root of 78234133 is about 8845.0061051420. The cubic root of 78234133 is about 427.6929498459.

The spelling of 78234133 in words is "seventy-eight million, two hundred thirty-four thousand, one hundred thirty-three".