721674068 has 6 divisors (see below), whose sum is σ = 1262929626. Its totient is φ = 360837032.

The previous prime is 721674053. The next prime is 721674073. The reversal of 721674068 is 860476127.

It can be written as a sum of positive squares in only one way, i.e., 644550544 + 77123524 = 25388^2 + 8782^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90209255 + ... + 90209262.

It is an arithmetic number, because the mean of its divisors is an integer number (210488271).

Almost surely, 2^721674068 is an apocalyptic number.

It is an amenable number.

721674068 is a deficient number, since it is larger than the sum of its proper divisors (541255558).

721674068 is a wasteful number, since it uses less digits than its factorization.

721674068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180418521 (or 180418519 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 721674068 is about 26863.9920339476. The cubic root of 721674068 is about 896.9750575853.

The spelling of 721674068 in words is "seven hundred twenty-one million, six hundred seventy-four thousand, sixty-eight".