71878251 has 4 divisors (see below), whose sum is σ = 95837672. Its totient is φ = 47918832.

The previous prime is 71878231. The next prime is 71878271. The reversal of 71878251 is 15287817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15287817 = 3 ⋅5095939.

It is an interprime number because it is at equal distance from previous prime (71878231) and next prime (71878271).

It is not a de Polignac number, because 71878251 - 2⁹ = 71877739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71878201) 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, 11979706 + ... + 11979711.

It is an arithmetic number, because the mean of its divisors is an integer number (23959418).

Almost surely, 2^71878251 is an apocalyptic number.

71878251 is a deficient number, since it is larger than the sum of its proper divisors (23959421).

71878251 is a wasteful number, since it uses less digits than its factorization.

71878251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23959420.

The product of its digits is 31360, while the sum is 39.

The square root of 71878251 is about 8478.1042102583. The cubic root of 71878251 is about 415.7821433107.

The spelling of 71878251 in words is "seventy-one million, eight hundred seventy-eight thousand, two hundred fifty-one".