721362545 has 32 divisors (see below), whose sum is σ = 910103040. Its totient is φ = 548363520.

The previous prime is 721362541. The next prime is 721362553. The reversal of 721362545 is 545263127.

It is not a de Polignac number, because 721362545 - 2² = 721362541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721362541) 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 31 ways as a sum of consecutive naturals, for example, 1673480 + ... + 1673910.

It is an arithmetic number, because the mean of its divisors is an integer number (28440720).

Almost surely, 2^721362545 is an apocalyptic number.

It is an amenable number.

721362545 is a deficient number, since it is larger than the sum of its proper divisors (188740495).

721362545 is a wasteful number, since it uses less digits than its factorization.

721362545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665.

The product of its digits is 50400, while the sum is 35.

The square root of 721362545 is about 26858.1932564348. The cubic root of 721362545 is about 896.8459741160.

The spelling of 721362545 in words is "seven hundred twenty-one million, three hundred sixty-two thousand, five hundred forty-five".