71290693 has 4 divisors (see below), whose sum is σ = 71432928. Its totient is φ = 71148460.

The previous prime is 71290663. The next prime is 71290697. The reversal of 71290693 is 39609217.

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 a de Polignac number, because none of the positive numbers 2^k-71290693 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 (71290697) 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, 70363 + ... + 71368.

It is an arithmetic number, because the mean of its divisors is an integer number (17858232).

Almost surely, 2^71290693 is an apocalyptic number.

It is an amenable number.

71290693 is a deficient number, since it is larger than the sum of its proper divisors (142235).

71290693 is a wasteful number, since it uses less digits than its factorization.

71290693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142234.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 71290693 is about 8443.3816092843. The cubic root of 71290693 is about 414.6461259726.

The spelling of 71290693 in words is "seventy-one million, two hundred ninety thousand, six hundred ninety-three".