721670004 has 72 divisors (see below), whose sum is σ = 2001373920. Its totient is φ = 217444800.

The previous prime is 721669999. The next prime is 721670083. The reversal of 721670004 is 400076127.

It is a self number, because there is not a number n which added to its sum of digits gives 721670004.

It is a congruent number.

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, 65794 + ... + 75974.

It is an arithmetic number, because the mean of its divisors is an integer number (27796860).

Almost surely, 2^721670004 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 721670004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000686960).

721670004 is an abundant number, since it is smaller than the sum of its proper divisors (1279703916).

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

721670004 is a wasteful number, since it uses less digits than its factorization.

721670004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10381 (or 10376 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 721670004 is about 26863.9163935566. The cubic root of 721670004 is about 896.9733738550.

The spelling of 721670004 in words is "seven hundred twenty-one million, six hundred seventy thousand, four".