720537630 has 64 divisors (see below), whose sum is σ = 1780446528. Its totient is φ = 186485760.

The previous prime is 720537613. The next prime is 720537637. The reversal of 720537630 is 36735027.

It is a junction number, because it is equal to n+sod(n) for n = 720537591 and 720537600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720537637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 844284 + ... + 845136.

It is an arithmetic number, because the mean of its divisors is an integer number (27819477).

Almost surely, 2^720537630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720537630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890223264).

720537630 is an abundant number, since it is smaller than the sum of its proper divisors (1059908898).

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

720537630 is a wasteful number, since it uses less digits than its factorization.

720537630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661.

The product of its (nonzero) digits is 26460, while the sum is 33.

The square root of 720537630 is about 26842.8320040938. The cubic root of 720537630 is about 896.5039806255.

The spelling of 720537630 in words is "seven hundred twenty million, five hundred thirty-seven thousand, six hundred thirty".