721344654 has 24 divisors (see below), whose sum is σ = 1564165512. Its totient is φ = 240255600.

The previous prime is 721344649. The next prime is 721344661. The reversal of 721344654 is 456443127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8017 + ... + 38819.

It is an arithmetic number, because the mean of its divisors is an integer number (65173563).

Almost surely, 2^721344654 is an apocalyptic number.

721344654 is an abundant number, since it is smaller than the sum of its proper divisors (842820858).

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

721344654 is a wasteful number, since it uses less digits than its factorization.

721344654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32112 (or 32109 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 721344654 is about 26857.8601902683. The cubic root of 721344654 is about 896.8385596270.

The spelling of 721344654 in words is "seven hundred twenty-one million, three hundred forty-four thousand, six hundred fifty-four".