71897949 has 10 divisors (see below), whose sum is σ = 107403230. Its totient is φ = 47931912.

The previous prime is 71897941. The next prime is 71897951. The reversal of 71897949 is 94979817.

It can be written as a sum of positive squares in only one way, i.e., 65318724 + 6579225 = 8082^2 + 2565^2 .

It is not a de Polignac number, because 71897949 - 2³ = 71897941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71897895 and 71897904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71897941) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 443734 + ... + 443895.

It is an arithmetic number, because the mean of its divisors is an integer number (10740323).

Almost surely, 2^71897949 is an apocalyptic number.

It is an amenable number.

71897949 is a deficient number, since it is larger than the sum of its proper divisors (35505281).

71897949 is an equidigital number, since it uses as much as digits as its factorization.

71897949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887641 (or 887632 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 71897949 is about 8479.2658290680. The cubic root of 71897949 is about 415.8201210880.

The spelling of 71897949 in words is "seventy-one million, eight hundred ninety-seven thousand, nine hundred forty-nine".