71604387 has 6 divisors (see below), whose sum is σ = 103428572. Its totient is φ = 47736252.

The previous prime is 71604367. The next prime is 71604427. The reversal of 71604387 is 78340617.

It is not a de Polignac number, because 71604387 - 2²⁶ = 4495523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71604317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3978013 + ... + 3978030.

Almost surely, 2^71604387 is an apocalyptic number.

71604387 is a deficient number, since it is larger than the sum of its proper divisors (31824185).

71604387 is a wasteful number, since it uses less digits than its factorization.

71604387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956049 (or 7956046 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 71604387 is about 8461.9375440853. The cubic root of 71604387 is about 415.2534127494.

The spelling of 71604387 in words is "seventy-one million, six hundred four thousand, three hundred eighty-seven".