78173071 has 4 divisors (see below), whose sum is σ = 78769944. Its totient is φ = 77576200.

The previous prime is 78173047. The next prime is 78173093. The reversal of 78173071 is 17037187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17037187 = 379 ⋅44953.

It is a cyclic number.

It is not a de Polignac number, because 78173071 - 2⁷ = 78172943 is a prime.

It is a super-2 number, since 2×78173071² = 12222058059142082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78173671) 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, 298240 + ... + 298501.

It is an arithmetic number, because the mean of its divisors is an integer number (19692486).

Almost surely, 2^78173071 is an apocalyptic number.

78173071 is a deficient number, since it is larger than the sum of its proper divisors (596873).

78173071 is a wasteful number, since it uses less digits than its factorization.

78173071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596872.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 78173071 is about 8841.5536530635. The cubic root of 78173071 is about 427.5816489625.

The spelling of 78173071 in words is "seventy-eight million, one hundred seventy-three thousand, seventy-one".