721452090 has 32 divisors (see below), whose sum is σ = 1748635776. Its totient is φ = 190481600.

The previous prime is 721452071. The next prime is 721452107. The reversal of 721452090 is 90254127.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 116022 + ... + 122081.

It is an arithmetic number, because the mean of its divisors is an integer number (54644868).

Almost surely, 2^721452090 is an apocalyptic number.

721452090 is an abundant number, since it is smaller than the sum of its proper divisors (1027183686).

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

721452090 is a wasteful number, since it uses less digits than its factorization.

721452090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238214.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 721452090 is about 26859.8602006786. The cubic root of 721452090 is about 896.8830820171.

The spelling of 721452090 in words is "seven hundred twenty-one million, four hundred fifty-two thousand, ninety".