890558721 has 12 divisors (see below), whose sum is σ = 1385313748. Its totient is φ = 548036064.

The previous prime is 890558717. The next prime is 890558741. The reversal of 890558721 is 127855098.

It is a happy number.

890558721 is a `hidden beast` number, since 8 + 90 + 558 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48108096 + 842450625 = 6936^2 + 29025^2 .

It is not a de Polignac number, because 890558721 - 2² = 890558717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (890558741) 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, 3805690 + ... + 3805923.

Almost surely, 2^890558721 is an apocalyptic number.

It is an amenable number.

890558721 is a deficient number, since it is larger than the sum of its proper divisors (494755027).

890558721 is a wasteful number, since it uses less digits than its factorization.

890558721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611632 (or 7611629 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 890558721 is about 29842.2304963955. The cubic root of 890558721 is about 962.1014155786.

The spelling of 890558721 in words is "eight hundred ninety million, five hundred fifty-eight thousand, seven hundred twenty-one".