78670775 has 6 divisors (see below), whose sum is σ = 97551792. Its totient is φ = 62936600.

The previous prime is 78670771. The next prime is 78670817. The reversal of 78670775 is 57707687.

It is not a de Polignac number, because 78670775 - 2² = 78670771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78670771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1573391 + ... + 1573440.

It is an arithmetic number, because the mean of its divisors is an integer number (16258632).

Almost surely, 2^78670775 is an apocalyptic number.

78670775 is a deficient number, since it is larger than the sum of its proper divisors (18881017).

78670775 is a wasteful number, since it uses less digits than its factorization.

78670775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146841 (or 3146836 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 47.

The square root of 78670775 is about 8869.6547283420. The cubic root of 78670775 is about 428.4871571077.

The spelling of 78670775 in words is "seventy-eight million, six hundred seventy thousand, seven hundred seventy-five".