721085090 has 32 divisors (see below), whose sum is σ = 1499243904. Its totient is φ = 246787840.

The previous prime is 721085089. The next prime is 721085111. The reversal of 721085090 is 90580127.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190934 + ... + 194673.

It is an arithmetic number, because the mean of its divisors is an integer number (46851372).

Almost surely, 2^721085090 is an apocalyptic number.

721085090 is an abundant number, since it is smaller than the sum of its proper divisors (778158814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721085090 is a wasteful number, since it uses less digits than its factorization.

721085090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385642.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 721085090 is about 26853.0275760481. The cubic root of 721085090 is about 896.7309758575.

The spelling of 721085090 in words is "seven hundred twenty-one million, eighty-five thousand, ninety".