78856457 has 8 divisors (see below), whose sum is σ = 80653440. Its totient is φ = 77079600.

The previous prime is 78856433. The next prime is 78856483. The reversal of 78856457 is 75465887.

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-78856457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78856417) 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, 3038 + ... + 12920.

It is an arithmetic number, because the mean of its divisors is an integer number (10081680).

Almost surely, 2^78856457 is an apocalyptic number.

It is an amenable number.

78856457 is a deficient number, since it is larger than the sum of its proper divisors (1796983).

78856457 is a wasteful number, since it uses less digits than its factorization.

78856457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10063.

The product of its digits is 1881600, while the sum is 50.

The square root of 78856457 is about 8880.1158213167. The cubic root of 78856457 is about 428.8240032399.

The spelling of 78856457 in words is "seventy-eight million, eight hundred fifty-six thousand, four hundred fifty-seven".