71390408 has 8 divisors (see below), whose sum is σ = 133857030. Its totient is φ = 35695200.

The previous prime is 71390401. The next prime is 71390441. The reversal of 71390408 is 80409317.

It can be written as a sum of positive squares in only one way, i.e., 62378404 + 9012004 = 7898^2 + 3002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (71390401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4461893 + ... + 4461908.

Almost surely, 2^71390408 is an apocalyptic number.

It is an amenable number.

71390408 is a deficient number, since it is larger than the sum of its proper divisors (62466622).

71390408 is a wasteful number, since it uses less digits than its factorization.

71390408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8923807 (or 8923803 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 71390408 is about 8449.2844667463. The cubic root of 71390408 is about 414.8393591258.

The spelling of 71390408 in words is "seventy-one million, three hundred ninety thousand, four hundred eight".