78356345 has 8 divisors (see below), whose sum is σ = 94627464. Its totient is φ = 62285184.

The previous prime is 78356339. The next prime is 78356351. The reversal of 78356345 is 54365387.

It is an interprime number because it is at equal distance from previous prime (78356339) and next prime (78356351).

It can be written as a sum of positive squares in 4 ways, for example, as 6801664 + 71554681 = 2608^2 + 8459^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78356345 - 2²⁴ = 61579129 is a prime.

It is a super-2 number, since 2×78356345² = 12279433603518050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49124 + ... + 50693.

It is an arithmetic number, because the mean of its divisors is an integer number (11828433).

Almost surely, 2^78356345 is an apocalyptic number.

It is an amenable number.

78356345 is a deficient number, since it is larger than the sum of its proper divisors (16271119).

78356345 is a wasteful number, since it uses less digits than its factorization.

78356345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99979.

The product of its digits is 302400, while the sum is 41.

The square root of 78356345 is about 8851.9119403663. The cubic root of 78356345 is about 427.9155381853.

The spelling of 78356345 in words is "seventy-eight million, three hundred fifty-six thousand, three hundred forty-five".