721048 has 16 divisors (see below), whose sum is σ = 1361880. Its totient is φ = 357888.

The previous prime is 721043. The next prime is 721051. The reversal of 721048 is 840127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721043) 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, 1311 + ... + 1777.

2⁷²¹⁰⁴⁸ is an apocalyptic number.

It is an amenable number.

721048 is a deficient number, since it is larger than the sum of its proper divisors (640832).

721048 is a wasteful number, since it uses less digits than its factorization.

721048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 721048 is about 849.1454527936. The cubic root of 721048 is about 89.6715600732.

Subtracting from 721048 its product of nonzero digits (448), we obtain a triangular number (720600 = T₁₂₀₀).

The spelling of 721048 in words is "seven hundred twenty-one thousand, forty-eight".