78670841 has 8 divisors (see below), whose sum is σ = 80857224. Its totient is φ = 76497280.

The previous prime is 78670831. The next prime is 78670847. The reversal of 78670841 is 14807687.

It can be written as a sum of positive squares in 4 ways, for example, as 12996025 + 65674816 = 3605^2 + 8104^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78670841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78670847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9971 + ... + 16023.

It is an arithmetic number, because the mean of its divisors is an integer number (10107153).

Almost surely, 2^78670841 is an apocalyptic number.

It is an amenable number.

78670841 is a deficient number, since it is larger than the sum of its proper divisors (2186383).

78670841 is a wasteful number, since it uses less digits than its factorization.

78670841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6411.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 78670841 is about 8869.6584488919. The cubic root of 78670841 is about 428.4872769326.

The spelling of 78670841 in words is "seventy-eight million, six hundred seventy thousand, eight hundred forty-one".