71385890 has 32 divisors (see below), whose sum is σ = 136617840. Its totient is φ = 26856192.

The previous prime is 71385883. The next prime is 71385911. The reversal of 71385890 is 9858317.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 55457809 + 15928081 = 7447^2 + 3991^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48404 + ... + 49856.

Almost surely, 2^71385890 is an apocalyptic number.

71385890 is a deficient number, since it is larger than the sum of its proper divisors (65231950).

71385890 is a wasteful number, since it uses less digits than its factorization.

71385890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 71385890 is about 8449.0171025984. The cubic root of 71385890 is about 414.8306077925.

The spelling of 71385890 in words is "seventy-one million, three hundred eighty-five thousand, eight hundred ninety".