720737280 has 132 divisors (see below), whose sum is σ = 2497495572. Its totient is φ = 192184320.

The previous prime is 720737239. The next prime is 720737299. The reversal of 720737280 is 82737027.

720737280 is a `hidden beast` number, since 7 + 207 + 372 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 557715456 + 163021824 = 23616^2 + 12768^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38260 + ... + 53900.

It is an arithmetic number, because the mean of its divisors is an integer number (18920421).

Almost surely, 2^720737280 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 720737280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248747786).

720737280 is an abundant number, since it is smaller than the sum of its proper divisors (1776758292).

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

720737280 is a wasteful number, since it uses less digits than its factorization.

720737280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15672 (or 15651 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 720737280 is about 26846.5506164200. The cubic root of 720737280 is about 896.5867755105.

It can be divided in two parts, 720 and 737280, that multiplied together give a square (530841600 = 23040²).

The spelling of 720737280 in words is "seven hundred twenty million, seven hundred thirty-seven thousand, two hundred eighty".