78390734 has 8 divisors (see below), whose sum is σ = 119513928. Its totient is φ = 38552760.

The previous prime is 78390733. The next prime is 78390743. The reversal of 78390734 is 43709387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78390734² = 12290214354117512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78390691 and 78390700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78390733) 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, 321152 + ... + 321395.

It is an arithmetic number, because the mean of its divisors is an integer number (14939241).

Almost surely, 2^78390734 is an apocalyptic number.

78390734 is a deficient number, since it is larger than the sum of its proper divisors (41123194).

78390734 is a wasteful number, since it uses less digits than its factorization.

78390734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642610.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 78390734 is about 8853.8541889959. The cubic root of 78390734 is about 427.9781301604.

The spelling of 78390734 in words is "seventy-eight million, three hundred ninety thousand, seven hundred thirty-four".