71381564 has 6 divisors (see below), whose sum is σ = 124917744. Its totient is φ = 35690780.

The previous prime is 71381509. The next prime is 71381617. The reversal of 71381564 is 46518317.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8922692 + ... + 8922699.

It is an arithmetic number, because the mean of its divisors is an integer number (20819624).

Almost surely, 2^71381564 is an apocalyptic number.

It is an amenable number.

71381564 is a deficient number, since it is larger than the sum of its proper divisors (53536180).

71381564 is a wasteful number, since it uses less digits than its factorization.

71381564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17845395 (or 17845393 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 71381564 is about 8448.7610926100. The cubic root of 71381564 is about 414.8222280157.

The spelling of 71381564 in words is "seventy-one million, three hundred eighty-one thousand, five hundred sixty-four".