721060749 has 12 divisors (see below), whose sum is σ = 1041836796. Its totient is φ = 480566592.

The previous prime is 721060723. The next prime is 721060777. The reversal of 721060749 is 947060127.

It is a happy number.

721060749 is a `hidden beast` number, since 7 + 2 + 1 + 0 + 607 + 49 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 400400100 + 320660649 = 20010^2 + 17907^2 .

It is not a de Polignac number, because 721060749 - 2⁹ = 721060237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721060349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27777 + ... + 47049.

It is an arithmetic number, because the mean of its divisors is an integer number (86819733).

Almost surely, 2^721060749 is an apocalyptic number.

It is an amenable number.

721060749 is a deficient number, since it is larger than the sum of its proper divisors (320776047).

721060749 is a wasteful number, since it uses less digits than its factorization.

721060749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23436 (or 23433 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 721060749 is about 26852.5743458611. The cubic root of 721060749 is about 896.7208857055.

The spelling of 721060749 in words is "seven hundred twenty-one million, sixty thousand, seven hundred forty-nine".