721673676 has 72 divisors (see below), whose sum is σ = 1914127488. Its totient is φ = 228960000.

The previous prime is 721673669. The next prime is 721673731. The reversal of 721673676 is 676376127.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62776 + ... + 73376.

It is an arithmetic number, because the mean of its divisors is an integer number (26585104).

Almost surely, 2^721673676 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 721673676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957063744).

721673676 is an abundant number, since it is smaller than the sum of its proper divisors (1192453812).

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

721673676 is a wasteful number, since it uses less digits than its factorization.

721673676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703 (or 10698 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 721673676 is about 26863.9847379349. The cubic root of 721673676 is about 896.9748951785.

The spelling of 721673676 in words is "seven hundred twenty-one million, six hundred seventy-three thousand, six hundred seventy-six".