721860834 has 64 divisors (see below), whose sum is σ = 1560176640. Its totient is φ = 221840640.

The previous prime is 721860791. The next prime is 721860847. The reversal of 721860834 is 438068127.

It is a junction number, because it is equal to n+sod(n) for n = 721860792 and 721860801.

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, 1904457 + ... + 1904835.

It is an arithmetic number, because the mean of its divisors is an integer number (24377760).

Almost surely, 2^721860834 is an apocalyptic number.

721860834 is an abundant number, since it is smaller than the sum of its proper divisors (838315806).

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

721860834 is a wasteful number, since it uses less digits than its factorization.

721860834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 721860834 is about 26867.4679491760. The cubic root of 721860834 is about 897.0524286135.

The spelling of 721860834 in words is "seven hundred twenty-one million, eight hundred sixty thousand, eight hundred thirty-four".