720689136 has 80 divisors (see below), whose sum is σ = 1911821088. Its totient is φ = 233856000.

The previous prime is 720689111. The next prime is 720689149. The reversal of 720689136 is 631986027.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294510 + ... + 296946.

Almost surely, 2^720689136 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 720689136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955910544).

720689136 is an abundant number, since it is smaller than the sum of its proper divisors (1191131952).

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

720689136 is a wasteful number, since it uses less digits than its factorization.

720689136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610 (or 2604 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 720689136 is about 26845.6539499413. The cubic root of 720689136 is about 896.5668115856.

The spelling of 720689136 in words is "seven hundred twenty million, six hundred eighty-nine thousand, one hundred thirty-six".