71640053 has 4 divisors (see below), whose sum is σ = 71662080. Its totient is φ = 71618028.

The previous prime is 71639999. The next prime is 71640059. The reversal of 71640053 is 35004617.

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 a cyclic number.

It is not a de Polignac number, because 71640053 - 2¹² = 71635957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71640059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5063 + ... + 12996.

It is an arithmetic number, because the mean of its divisors is an integer number (17915520).

Almost surely, 2^71640053 is an apocalyptic number.

It is an amenable number.

71640053 is a deficient number, since it is larger than the sum of its proper divisors (22027).

71640053 is a wasteful number, since it uses less digits than its factorization.

71640053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22026.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 71640053 is about 8464.0447186909. The cubic root of 71640053 is about 415.3223469330.

The spelling of 71640053 in words is "seventy-one million, six hundred forty thousand, fifty-three".