71997494 has 4 divisors (see below), whose sum is σ = 107996244. Its totient is φ = 35998746.

The previous prime is 71997481. The next prime is 71997503. The reversal of 71997494 is 49479917.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17999372 + ... + 17999375.

It is an arithmetic number, because the mean of its divisors is an integer number (26999061).

Almost surely, 2^71997494 is an apocalyptic number.

71997494 is a deficient number, since it is larger than the sum of its proper divisors (35998750).

71997494 is a wasteful number, since it uses less digits than its factorization.

71997494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35998749.

The product of its digits is 571536, while the sum is 50.

The square root of 71997494 is about 8485.1337054875. The cubic root of 71997494 is about 416.0119379895.

The spelling of 71997494 in words is "seventy-one million, nine hundred ninety-seven thousand, four hundred ninety-four".