720890 has 8 divisors (see below), whose sum is σ = 1297620. Its totient is φ = 288352.

The previous prime is 720887. The next prime is 720899. The reversal of 720890 is 98027.

720890 is nontrivially palindromic in base 4 and base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 3481 = 847^2 + 59^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (720899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36035 + ... + 36054.

2⁷²⁰⁸⁹⁰ is an apocalyptic number.

720890 is a deficient number, since it is larger than the sum of its proper divisors (576730).

720890 is a wasteful number, since it uses less digits than its factorization.

720890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72096.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 720890 is about 849.0524129876. The cubic root of 720890 is about 89.6650098197.

The spelling of 720890 in words is "seven hundred twenty thousand, eight hundred ninety".