71299978 has 4 divisors (see below), whose sum is σ = 106949970. Its totient is φ = 35649988.

The previous prime is 71299967. The next prime is 71299997. The reversal of 71299978 is 87999217.

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

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 3286969 = 8247^2 + 1813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17824993 + ... + 17824996.

Almost surely, 2^71299978 is an apocalyptic number.

71299978 is a deficient number, since it is larger than the sum of its proper divisors (35649992).

71299978 is a wasteful number, since it uses less digits than its factorization.

71299978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35649991.

The product of its digits is 571536, while the sum is 52.

The square root of 71299978 is about 8443.9314303232. The cubic root of 71299978 is about 414.6641265558.

The spelling of 71299978 in words is "seventy-one million, two hundred ninety-nine thousand, nine hundred seventy-eight".