78163031 has 4 divisors (see below), whose sum is σ = 78195600. Its totient is φ = 78130464.

The previous prime is 78163003. The next prime is 78163037. The reversal of 78163031 is 13036187.

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

It is a cyclic number.

It is not a de Polignac number, because 78163031 - 2¹⁸ = 77900887 is a prime.

It is a super-2 number, since 2×78163031² = 12218918830213922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78162985 and 78163003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78163037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12371 + ... + 17588.

It is an arithmetic number, because the mean of its divisors is an integer number (19548900).

Almost surely, 2^78163031 is an apocalyptic number.

78163031 is a deficient number, since it is larger than the sum of its proper divisors (32569).

78163031 is a wasteful number, since it uses less digits than its factorization.

78163031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32568.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 78163031 is about 8840.9858613166. The cubic root of 78163031 is about 427.5633429845.

The spelling of 78163031 in words is "seventy-eight million, one hundred sixty-three thousand, thirty-one".