78340745 has 32 divisors (see below), whose sum is σ = 112665600. Its totient is φ = 51158016.

The previous prime is 78340739. The next prime is 78340747. The reversal of 78340745 is 54704387.

It is not a de Polignac number, because 78340745 - 2¹⁰ = 78339721 is a prime.

It is a super-2 number, since 2×78340745² = 12274544654310050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78340699 and 78340708.

It is not an unprimeable number, because it can be changed into a prime (78340747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79697 + ... + 80673.

It is an arithmetic number, because the mean of its divisors is an integer number (3520800).

Almost surely, 2^78340745 is an apocalyptic number.

It is an amenable number.

78340745 is a deficient number, since it is larger than the sum of its proper divisors (34324855).

78340745 is a wasteful number, since it uses less digits than its factorization.

78340745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 78340745 is about 8851.0307309375. The cubic root of 78340745 is about 427.8871383348.

The spelling of 78340745 in words is "seventy-eight million, three hundred forty thousand, seven hundred forty-five".