71899345 has 16 divisors (see below), whose sum is σ = 99203328. Its totient is φ = 49003200.

The previous prime is 71899313. The next prime is 71899349. The reversal of 71899345 is 54399817.

It is a happy number.

It is not a de Polignac number, because 71899345 - 2⁵ = 71899313 is a prime.

It is a super-2 number, since 2×71899345² = 10339031622858050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71899295 and 71899304.

It is not an unprimeable number, because it can be changed into a prime (71899349) 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, 306 + ... + 11995.

It is an arithmetic number, because the mean of its divisors is an integer number (6200208).

Almost surely, 2^71899345 is an apocalyptic number.

It is an amenable number.

71899345 is a deficient number, since it is larger than the sum of its proper divisors (27303983).

71899345 is a wasteful number, since it uses less digits than its factorization.

71899345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12480.

The product of its digits is 272160, while the sum is 46.

The square root of 71899345 is about 8479.3481471160. The cubic root of 71899345 is about 415.8228123151.

The spelling of 71899345 in words is "seventy-one million, eight hundred ninety-nine thousand, three hundred forty-five".