71650649 has 4 divisors (see below), whose sum is σ = 81886464. Its totient is φ = 61414836.

The previous prime is 71650637. The next prime is 71650651. The reversal of 71650649 is 94605617.

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.

It is not a de Polignac number, because 71650649 - 2⁴ = 71650633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71650669) 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, 5117897 + ... + 5117910.

It is an arithmetic number, because the mean of its divisors is an integer number (20471616).

Almost surely, 2^71650649 is an apocalyptic number.

It is an amenable number.

71650649 is a deficient number, since it is larger than the sum of its proper divisors (10235815).

71650649 is a wasteful number, since it uses less digits than its factorization.

71650649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10235814.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 71650649 is about 8464.6706374200. The cubic root of 71650649 is about 415.3428221581.

The spelling of 71650649 in words is "seventy-one million, six hundred fifty thousand, six hundred forty-nine".