721327487 has 4 divisors (see below), whose sum is σ = 722419416. Its totient is φ = 720235560.

The previous prime is 721327483. The next prime is 721327489. The reversal of 721327487 is 784723127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721327487 - 2² = 721327483 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721327483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544973 + ... + 546294.

It is an arithmetic number, because the mean of its divisors is an integer number (180604854).

Almost surely, 2^721327487 is an apocalyptic number.

721327487 is a deficient number, since it is larger than the sum of its proper divisors (1091929).

721327487 is a wasteful number, since it uses less digits than its factorization.

721327487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091928.

The product of its digits is 131712, while the sum is 41.

The square root of 721327487 is about 26857.5405984986. The cubic root of 721327487 is about 896.8314450669.

The spelling of 721327487 in words is "seven hundred twenty-one million, three hundred twenty-seven thousand, four hundred eighty-seven".