71963857 has 4 divisors (see below), whose sum is σ = 82244416. Its totient is φ = 61683300.

The previous prime is 71963851. The next prime is 71963863. The reversal of 71963857 is 75836917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75836917 = 13 ⋅5833609.

It is an interprime number because it is at equal distance from previous prime (71963851) and next prime (71963863).

It is not a de Polignac number, because 71963857 - 2⁷ = 71963729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71963851) 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, 5140269 + ... + 5140282.

It is an arithmetic number, because the mean of its divisors is an integer number (20561104).

Almost surely, 2^71963857 is an apocalyptic number.

It is an amenable number.

71963857 is a deficient number, since it is larger than the sum of its proper divisors (10280559).

71963857 is a wasteful number, since it uses less digits than its factorization.

71963857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280558.

The product of its digits is 317520, while the sum is 46.

The square root of 71963857 is about 8483.1513601963. The cubic root of 71963857 is about 415.9471414132.

The spelling of 71963857 in words is "seventy-one million, nine hundred sixty-three thousand, eight hundred fifty-seven".