720624 has 20 divisors (see below), whose sum is σ = 1861736. Its totient is φ = 240192.

The previous prime is 720619. The next prime is 720653. The reversal of 720624 is 426027.

720624 = T₁₉ + T₂₀ + ... + T₁₆₂.

It is a happy number.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 720624.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 7459 + ... + 7554.

2⁷²⁰⁶²⁴ is an apocalyptic number.

It is an amenable number.

720624 is an abundant number, since it is smaller than the sum of its proper divisors (1141112).

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

720624 is a wasteful number, since it uses less digits than its factorization.

720624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15024 (or 15018 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 720624 is about 848.8957533172. The cubic root of 720624 is about 89.6539800154.

The spelling of 720624 in words is "seven hundred twenty thousand, six hundred twenty-four".