720654220 has 72 divisors (see below), whose sum is σ = 1791497232. Its totient is φ = 241887360.

The previous prime is 720654203. The next prime is 720654247. The reversal of 720654220 is 22456027.

720654220 = T₄₂₉ + T₄₃₀ + ... + T₁₆₃₈.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20007 + ... + 42913.

It is an arithmetic number, because the mean of its divisors is an integer number (24881906).

Almost surely, 2^720654220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720654220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895748616).

720654220 is an abundant number, since it is smaller than the sum of its proper divisors (1070843012).

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

720654220 is a wasteful number, since it uses less digits than its factorization.

720654220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22951 (or 22938 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 720654220 is about 26845.0036319610. The cubic root of 720654220 is about 896.5523323736.

It can be divided in two parts, 720 and 654220, that added together give a triangular number (654940 = T₁₁₄₄).

The spelling of 720654220 in words is "seven hundred twenty million, six hundred fifty-four thousand, two hundred twenty".