724778 has 8 divisors (see below), whose sum is σ = 1151172. Its totient is φ = 341056.

The previous prime is 724777. The next prime is 724781. The reversal of 724778 is 877427.

724778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 537289 + 187489 = 733^2 + 433^2 .

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

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (724777) 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, 10625 + ... + 10692.

2⁷²⁴⁷⁷⁸ is an apocalyptic number.

724778 is a deficient number, since it is larger than the sum of its proper divisors (426394).

724778 is a wasteful number, since it uses less digits than its factorization.

724778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21336.

The product of its digits is 21952, while the sum is 35.

The square root of 724778 is about 851.3389454266. The cubic root of 724778 is about 89.8259186465.

The spelling of 724778 in words is "seven hundred twenty-four thousand, seven hundred seventy-eight".