71678431 has 16 divisors (see below), whose sum is σ = 84072960. Its totient is φ = 60410880.

The previous prime is 71678413. The next prime is 71678437. The reversal of 71678431 is 13487617.

It is not a de Polignac number, because 71678431 - 2⁷ = 71678303 is a prime.

It is a super-2 number, since 2×71678431² = 10275594941243522, 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 (71678437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6175 + ... + 13471.

It is an arithmetic number, because the mean of its divisors is an integer number (5254560).

Almost surely, 2^71678431 is an apocalyptic number.

71678431 is a deficient number, since it is larger than the sum of its proper divisors (12394529).

71678431 is a wasteful number, since it uses less digits than its factorization.

71678431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374.

The product of its digits is 28224, while the sum is 37.

The square root of 71678431 is about 8466.3115345468. The cubic root of 71678431 is about 415.3964972393.

The spelling of 71678431 in words is "seventy-one million, six hundred seventy-eight thousand, four hundred thirty-one".