721004890 has 16 divisors (see below), whose sum is σ = 1301960808. Its totient is φ = 287479296.

The previous prime is 721004881. The next prime is 721004927. The reversal of 721004890 is 98400127.

It can be written as a sum of positive squares in 4 ways, for example, as 487129041 + 233875849 = 22071^2 + 15293^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112047 + ... + 118306.

Almost surely, 2^721004890 is an apocalyptic number.

721004890 is a deficient number, since it is larger than the sum of its proper divisors (580955918).

721004890 is a wasteful number, since it uses less digits than its factorization.

721004890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230673.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 721004890 is about 26851.5342205990. The cubic root of 721004890 is about 896.6977294386.

The spelling of 721004890 in words is "seven hundred twenty-one million, four thousand, eight hundred ninety".