71621563 has 16 divisors (see below), whose sum is σ = 83091456. Its totient is φ = 61189920.

The previous prime is 71621549. The next prime is 71621567. The reversal of 71621563 is 36512617.

It is a cyclic number.

It is not a de Polignac number, because 71621563 - 2¹³ = 71613371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (71621567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5406 + ... + 13132.

It is an arithmetic number, because the mean of its divisors is an integer number (5193216).

Almost surely, 2^71621563 is an apocalyptic number.

71621563 is a deficient number, since it is larger than the sum of its proper divisors (11469893).

71621563 is a wasteful number, since it uses less digits than its factorization.

71621563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7794.

The product of its digits is 7560, while the sum is 31.

The square root of 71621563 is about 8462.9523808184. The cubic root of 71621563 is about 415.2866128679.

The spelling of 71621563 in words is "seventy-one million, six hundred twenty-one thousand, five hundred sixty-three".