721481629 has 4 divisors (see below), whose sum is σ = 787070880. Its totient is φ = 655892380.

The previous prime is 721481627. The next prime is 721481639. The reversal of 721481629 is 926184127.

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.

It is not a de Polignac number, because 721481629 - 2¹ = 721481627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721481591 and 721481600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721481627) 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, 32794609 + ... + 32794630.

It is an arithmetic number, because the mean of its divisors is an integer number (196767720).

Almost surely, 2^721481629 is an apocalyptic number.

It is an amenable number.

721481629 is a deficient number, since it is larger than the sum of its proper divisors (65589251).

721481629 is a wasteful number, since it uses less digits than its factorization.

721481629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65589250.

The product of its digits is 48384, while the sum is 40.

The square root of 721481629 is about 26860.4100676069. The cubic root of 721481629 is about 896.8953224547.

The spelling of 721481629 in words is "seven hundred twenty-one million, four hundred eighty-one thousand, six hundred twenty-nine".