675413721 has 20 divisors (see below), whose sum is σ = 1010111872. Its totient is φ = 449758008.

The previous prime is 675413707. The next prime is 675413747. The reversal of 675413721 is 127314576.

It is a happy number.

675413721 is a `hidden beast` number, since 67 + 541 + 37 + 21 = 666.

It is not a de Polignac number, because 675413721 - 2¹⁷ = 675282649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (675413021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74016 + ... + 82638.

Almost surely, 2^675413721 is an apocalyptic number.

It is an amenable number.

675413721 is a deficient number, since it is larger than the sum of its proper divisors (334698151).

675413721 is an equidigital number, since it uses as much as digits as its factorization.

675413721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9602 (or 9593 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 675413721 is about 25988.7229582371. The cubic root of 675413721 is about 877.3845037559.

The spelling of 675413721 in words is "six hundred seventy-five million, four hundred thirteen thousand, seven hundred twenty-one".