71672530 has 8 divisors (see below), whose sum is σ = 129010572. Its totient is φ = 28669008.

The previous prime is 71672521. The next prime is 71672533. The reversal of 71672530 is 3527617.

It can be written as a sum of positive squares in 2 ways, for example, as 58690921 + 12981609 = 7661^2 + 3603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 71672492 and 71672501.

It is not an unprimeable number, because it can be changed into a prime (71672533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3583617 + ... + 3583636.

Almost surely, 2^71672530 is an apocalyptic number.

71672530 is a deficient number, since it is larger than the sum of its proper divisors (57338042).

71672530 is a wasteful number, since it uses less digits than its factorization.

71672530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167260.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 71672530 is about 8465.9630285042. The cubic root of 71672530 is about 415.3850976130.

The spelling of 71672530 in words is "seventy-one million, six hundred seventy-two thousand, five hundred thirty".