71535540 has 24 divisors (see below), whose sum is σ = 200299680. Its totient is φ = 19076128.

The previous prime is 71535533. The next prime is 71535571. The reversal of 71535540 is 4553517.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71535498 and 71535507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596070 + ... + 596189.

It is an arithmetic number, because the mean of its divisors is an integer number (8345820).

Almost surely, 2^71535540 is an apocalyptic number.

It is an amenable number.

71535540 is an abundant number, since it is smaller than the sum of its proper divisors (128764140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71535540 is a wasteful number, since it uses less digits than its factorization.

71535540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192271 (or 1192269 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 71535540 is about 8457.8685258167. The cubic root of 71535540 is about 415.1202825485.

The spelling of 71535540 in words is "seventy-one million, five hundred thirty-five thousand, five hundred forty".