78100705 has 8 divisors (see below), whose sum is σ = 93781800. Its totient is φ = 62439936.

The previous prime is 78100681. The next prime is 78100721. The reversal of 78100705 is 50700187.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22165264 + 55935441 = 4708^2 + 7479^2 .

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 78100705 - 2⁷ = 78100577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5311 + ... + 13579.

It is an arithmetic number, because the mean of its divisors is an integer number (11722725).

Almost surely, 2^78100705 is an apocalyptic number.

It is an amenable number.

78100705 is a deficient number, since it is larger than the sum of its proper divisors (15681095).

78100705 is a wasteful number, since it uses less digits than its factorization.

78100705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 78100705 is about 8837.4603252292. The cubic root of 78100705 is about 427.4496686182.

The spelling of 78100705 in words is "seventy-eight million, one hundred thousand, seven hundred five".