721288983 has 16 divisors (see below), whose sum is σ = 991434240. Its totient is φ = 466225344.

The previous prime is 721288979. The next prime is 721288987. The reversal of 721288983 is 389882127.

It is an interprime number because it is at equal distance from previous prime (721288979) and next prime (721288987).

It is not a de Polignac number, because 721288983 - 2² = 721288979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721288987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14991 + ... + 40832.

It is an arithmetic number, because the mean of its divisors is an integer number (61964640).

Almost surely, 2^721288983 is an apocalyptic number.

721288983 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

721288983 is a deficient number, since it is larger than the sum of its proper divisors (270145257).

721288983 is a wasteful number, since it uses less digits than its factorization.

721288983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55958.

The product of its digits is 387072, while the sum is 48.

The square root of 721288983 is about 26856.8237697610. The cubic root of 721288983 is about 896.8154873532.

The spelling of 721288983 in words is "seven hundred twenty-one million, two hundred eighty-eight thousand, nine hundred eighty-three".