721642366 has 16 divisors (see below), whose sum is σ = 1122697728. Its totient is φ = 347520600.

The previous prime is 721642343. The next prime is 721642373. The reversal of 721642366 is 663246127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14500 + ... + 40663.

It is an arithmetic number, because the mean of its divisors is an integer number (70168608).

Almost surely, 2^721642366 is an apocalyptic number.

721642366 is a deficient number, since it is larger than the sum of its proper divisors (401055362).

721642366 is a wasteful number, since it uses less digits than its factorization.

721642366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55407.

The product of its digits is 72576, while the sum is 37.

The square root of 721642366 is about 26863.4019811341. The cubic root of 721642366 is about 896.9619231612.

The spelling of 721642366 in words is "seven hundred twenty-one million, six hundred forty-two thousand, three hundred sixty-six".