721130607 has 40 divisors (see below), whose sum is σ = 1096167072. Its totient is φ = 472392000.

The previous prime is 721130603. The next prime is 721130609. The reversal of 721130607 is 706031127.

721130607 is a `hidden beast` number, since 7 + 21 + 1 + 30 + 607 = 666.

It is not a de Polignac number, because 721130607 - 2² = 721130603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721130603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1480518 + ... + 1481004.

Almost surely, 2^721130607 is an apocalyptic number.

721130607 is a deficient number, since it is larger than the sum of its proper divisors (375036465).

721130607 is a wasteful number, since it uses less digits than its factorization.

721130607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 721130607 is about 26853.8750834959. The cubic root of 721130607 is about 896.7498435545.

It can be divided in two parts, 721 and 130607, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 721130607 in words is "seven hundred twenty-one million, one hundred thirty thousand, six hundred seven".