71999345 has 8 divisors (see below), whose sum is σ = 94253760. Its totient is φ = 52363120.

The previous prime is 71999311. The next prime is 71999351. The reversal of 71999345 is 54399917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71999345 - 2⁸ = 71999089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71999345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654485 + ... + 654594.

It is an arithmetic number, because the mean of its divisors is an integer number (11781720).

Almost surely, 2^71999345 is an apocalyptic number.

It is an amenable number.

71999345 is a deficient number, since it is larger than the sum of its proper divisors (22254415).

71999345 is a wasteful number, since it uses less digits than its factorization.

71999345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309095.

The product of its digits is 306180, while the sum is 47.

The square root of 71999345 is about 8485.2427779057. The cubic root of 71999345 is about 416.0155030742.

The spelling of 71999345 in words is "seventy-one million, nine hundred ninety-nine thousand, three hundred forty-five".