78190271 has 4 divisors (see below), whose sum is σ = 81589872. Its totient is φ = 74790672.

The previous prime is 78190253. The next prime is 78190303. The reversal of 78190271 is 17209187.

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 78190271 - 2¹⁸ = 77928127 is a prime.

It is a super-2 number, since 2×78190271² = 12227436958106882, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78190201) 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, 1699766 + ... + 1699811.

It is an arithmetic number, because the mean of its divisors is an integer number (20397468).

Almost surely, 2^78190271 is an apocalyptic number.

78190271 is a deficient number, since it is larger than the sum of its proper divisors (3399601).

78190271 is a wasteful number, since it uses less digits than its factorization.

78190271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399600.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 78190271 is about 8842.5262792937. The cubic root of 78190271 is about 427.6130061590.

The spelling of 78190271 in words is "seventy-eight million, one hundred ninety thousand, two hundred seventy-one".