78856157 has 4 divisors (see below), whose sum is σ = 81399936. Its totient is φ = 76312380.

The previous prime is 78856147. The next prime is 78856163. The reversal of 78856157 is 75165887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78856157 - 2⁶ = 78856093 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 (78856117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271843 + ... + 1271904.

It is an arithmetic number, because the mean of its divisors is an integer number (20349984).

Almost surely, 2^78856157 is an apocalyptic number.

It is an amenable number.

78856157 is a deficient number, since it is larger than the sum of its proper divisors (2543779).

78856157 is a wasteful number, since it uses less digits than its factorization.

78856157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543778.

The product of its digits is 470400, while the sum is 47.

The square root of 78856157 is about 8880.0989296291. The cubic root of 78856157 is about 428.8234594359.

The spelling of 78856157 in words is "seventy-eight million, eight hundred fifty-six thousand, one hundred fifty-seven".