71552387 has 4 divisors (see below), whose sum is σ = 73216440. Its totient is φ = 69888336.

The previous prime is 71552363. The next prime is 71552389. The reversal of 71552387 is 78325517.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71552387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71552387.

It is not an unprimeable number, because it can be changed into a prime (71552389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831962 + ... + 832047.

It is an arithmetic number, because the mean of its divisors is an integer number (18304110).

Almost surely, 2^71552387 is an apocalyptic number.

71552387 is a deficient number, since it is larger than the sum of its proper divisors (1664053).

71552387 is a wasteful number, since it uses less digits than its factorization.

71552387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664052.

The product of its digits is 58800, while the sum is 38.

The square root of 71552387 is about 8458.8644036892. The cubic root of 71552387 is about 415.1528676685.

The spelling of 71552387 in words is "seventy-one million, five hundred fifty-two thousand, three hundred eighty-seven".