78234719 has 4 divisors (see below), whose sum is σ = 78523680. Its totient is φ = 77945760.

The previous prime is 78234677. The next prime is 78234763. The reversal of 78234719 is 91743287.

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 78234719 - 2⁸ = 78234463 is a prime.

It is a super-2 number, since 2×78234719² = 12241342514017922, 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 (78234769) 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, 144074 + ... + 144615.

It is an arithmetic number, because the mean of its divisors is an integer number (19630920).

Almost surely, 2^78234719 is an apocalyptic number.

78234719 is a deficient number, since it is larger than the sum of its proper divisors (288961).

78234719 is a wasteful number, since it uses less digits than its factorization.

78234719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288960.

The product of its digits is 84672, while the sum is 41.

The square root of 78234719 is about 8845.0392311171. The cubic root of 78234719 is about 427.6940176979.

The spelling of 78234719 in words is "seventy-eight million, two hundred thirty-four thousand, seven hundred nineteen".