730821636 has 96 divisors (see below), whose sum is σ = 2053054080. Its totient is φ = 223921152.

The previous prime is 730821629. The next prime is 730821647. The reversal of 730821636 is 636128037.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 730821636.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74320 + ... + 83576.

It is an arithmetic number, because the mean of its divisors is an integer number (21385980).

Almost surely, 2^730821636 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 730821636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026527040).

730821636 is an abundant number, since it is smaller than the sum of its proper divisors (1322232444).

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

730821636 is a wasteful number, since it uses less digits than its factorization.

730821636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9330 (or 9322 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 730821636 is about 27033.7129525339. The cubic root of 730821636 is about 900.7490209023.

The spelling of 730821636 in words is "seven hundred thirty million, eight hundred twenty-one thousand, six hundred thirty-six".