78570869 has 16 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 70217280.

The previous prime is 78570859. The next prime is 78570907. The reversal of 78570869 is 96807587.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78570869 - 2⁴ = 78570853 is a prime.

It is a super-2 number, since 2×78570869² = 12346762910830322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78570859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182084 + ... + 182514.

It is an arithmetic number, because the mean of its divisors is an integer number (5458320).

Almost surely, 2^78570869 is an apocalyptic number.

It is an amenable number.

78570869 is a deficient number, since it is larger than the sum of its proper divisors (8762251).

78570869 is a wasteful number, since it uses less digits than its factorization.

78570869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 78570869 is about 8864.0210401375. The cubic root of 78570869 is about 428.3056980594.

The spelling of 78570869 in words is "seventy-eight million, five hundred seventy thousand, eight hundred sixty-nine".