78157067 has 4 divisors (see below), whose sum is σ = 78589056. Its totient is φ = 77725080.

The previous prime is 78157049. The next prime is 78157073. The reversal of 78157067 is 76075187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78157067 is a prime.

It is a super-2 number, since 2×78157067² = 12217054244084978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78157367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215723 + ... + 216084.

It is an arithmetic number, because the mean of its divisors is an integer number (19647264).

Almost surely, 2^78157067 is an apocalyptic number.

78157067 is a deficient number, since it is larger than the sum of its proper divisors (431989).

78157067 is a wasteful number, since it uses less digits than its factorization.

78157067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431988.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 78157067 is about 8840.6485621814. The cubic root of 78157067 is about 427.5524680538.

The spelling of 78157067 in words is "seventy-eight million, one hundred fifty-seven thousand, sixty-seven".