78700705 has 4 divisors (see below), whose sum is σ = 94440852. Its totient is φ = 62960560.

The previous prime is 78700691. The next prime is 78700709. The reversal of 78700705 is 50700787.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56685841 + 22014864 = 7529^2 + 4692^2 .

It is not a de Polignac number, because 78700705 - 2²³ = 70312097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78700709) 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, 7870066 + ... + 7870075.

It is an arithmetic number, because the mean of its divisors is an integer number (23610213).

Almost surely, 2^78700705 is an apocalyptic number.

It is an amenable number.

78700705 is a deficient number, since it is larger than the sum of its proper divisors (15740147).

78700705 is a wasteful number, since it uses less digits than its factorization.

78700705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15740146.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 78700705 is about 8871.3417812640. The cubic root of 78700705 is about 428.5414889932.

The spelling of 78700705 in words is "seventy-eight million, seven hundred thousand, seven hundred five".