721860898 has 16 divisors (see below), whose sum is σ = 1213153344. Its totient is φ = 319250160.

The previous prime is 721860871. The next prime is 721860917. The reversal of 721860898 is 898068127.

It is a super-2 number, since 2×721860898² = 1042166312122732808, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442590 + ... + 444217.

It is an arithmetic number, because the mean of its divisors is an integer number (75822084).

Almost surely, 2^721860898 is an apocalyptic number.

721860898 is a deficient number, since it is larger than the sum of its proper divisors (491292446).

721860898 is a wasteful number, since it uses less digits than its factorization.

721860898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886857.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 721860898 is about 26867.4691402075. The cubic root of 721860898 is about 897.0524551244.

The spelling of 721860898 in words is "seven hundred twenty-one million, eight hundred sixty thousand, eight hundred ninety-eight".