721248677 has 4 divisors (see below), whose sum is σ = 724483200. Its totient is φ = 718014156.

The previous prime is 721248667. The next prime is 721248679. The reversal of 721248677 is 776842127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 776842127 = 5351 ⋅145177.

It is a cyclic number.

It is not a de Polignac number, because 721248677 - 2¹² = 721244581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721248679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616927 + ... + 1617372.

It is an arithmetic number, because the mean of its divisors is an integer number (181120800).

Almost surely, 2^721248677 is an apocalyptic number.

It is an amenable number.

721248677 is a deficient number, since it is larger than the sum of its proper divisors (3234523).

721248677 is a wasteful number, since it uses less digits than its factorization.

721248677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234522.

The product of its digits is 263424, while the sum is 44.

The square root of 721248677 is about 26856.0733727029. The cubic root of 721248677 is about 896.7987822049.

The spelling of 721248677 in words is "seven hundred twenty-one million, two hundred forty-eight thousand, six hundred seventy-seven".