71578996797 has 144 divisors (see below), whose sum is σ = 127454925696. Its totient is φ = 35565868800.

The previous prime is 71578996793. The next prime is 71578996817. The reversal of 71578996797 is 79769987517.

It is a happy number.

It is not a de Polignac number, because 71578996797 - 2² = 71578996793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71578996793) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 40144368 + ... + 40146150.

Almost surely, 2^71578996797 is an apocalyptic number.

71578996797 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

71578996797 is a deficient number, since it is larger than the sum of its proper divisors (55875928899).

71578996797 is a wasteful number, since it uses less digits than its factorization.

71578996797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1902 counting only the distinct ones).

The product of its digits is 420078960, while the sum is 75.

The spelling of 71578996797 in words is "seventy-one billion, five hundred seventy-eight million, nine hundred ninety-six thousand, seven hundred ninety-seven".