727251721 has 16 divisors (see below), whose sum is σ = 885458304. Its totient is φ = 583075584.

The previous prime is 727251719. The next prime is 727251731. The reversal of 727251721 is 127152727.

It is not a de Polignac number, because 727251721 - 2¹ = 727251719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (727251731) 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, 651 + ... + 38143.

It is an arithmetic number, because the mean of its divisors is an integer number (55341144).

Almost surely, 2^727251721 is an apocalyptic number.

It is an amenable number.

727251721 is a deficient number, since it is larger than the sum of its proper divisors (158206583).

727251721 is a wasteful number, since it uses less digits than its factorization.

727251721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37680.

The product of its digits is 13720, while the sum is 34.

The square root of 727251721 is about 26967.6050289973. The cubic root of 727251721 is about 899.2799677234.

The spelling of 727251721 in words is "seven hundred twenty-seven million, two hundred fifty-one thousand, seven hundred twenty-one".