78157271 has 4 divisors (see below), whose sum is σ = 78295200. Its totient is φ = 78019344.

The previous prime is 78157249. The next prime is 78157319. The reversal of 78157271 is 17275187.

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 78157271 - 2⁶ = 78157207 is a prime.

It is a super-2 number, since 2×78157271² = 12217118020334882, 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 (78157201) 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, 68111 + ... + 69248.

It is an arithmetic number, because the mean of its divisors is an integer number (19573800).

Almost surely, 2^78157271 is an apocalyptic number.

78157271 is a deficient number, since it is larger than the sum of its proper divisors (137929).

78157271 is a wasteful number, since it uses less digits than its factorization.

78157271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137928.

The product of its digits is 27440, while the sum is 38.

The square root of 78157271 is about 8840.6600997889. The cubic root of 78157271 is about 427.5528400424.

It can be divided in two parts, 7815 and 7271, that multiplied together give a palindrome (56822865).

The spelling of 78157271 in words is "seventy-eight million, one hundred fifty-seven thousand, two hundred seventy-one".