71087621 has 12 divisors (see below), whose sum is σ = 78429036. Its totient is φ = 64384320.

The previous prime is 71087617. The next prime is 71087633. The reversal of 71087621 is 12678017.

It can be written as a sum of positive squares in 2 ways, for example, as 16120225 + 54967396 = 4015^2 + 7414^2 .

It is not a de Polignac number, because 71087621 - 2² = 71087617 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71087651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36935 + ... + 38811.

It is an arithmetic number, because the mean of its divisors is an integer number (6535753).

Almost surely, 2^71087621 is an apocalyptic number.

It is an amenable number.

71087621 is a deficient number, since it is larger than the sum of its proper divisors (7341415).

71087621 is a wasteful number, since it uses less digits than its factorization.

71087621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 71087621 is about 8431.3475198215. The cubic root of 71087621 is about 414.2520441636.

The spelling of 71087621 in words is "seventy-one million, eighty-seven thousand, six hundred twenty-one".