64721741 has 4 divisors (see below), whose sum is σ = 73967712. Its totient is φ = 55475772.

The previous prime is 64721731. The next prime is 64721749. The reversal of 64721741 is 14712746.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64721741 is a prime.

It is a super-3 number, since 3×64721741³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64721698 and 64721707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721749) 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, 4622975 + ... + 4622988.

It is an arithmetic number, because the mean of its divisors is an integer number (18491928).

Almost surely, 2^64721741 is an apocalyptic number.

It is an amenable number.

64721741 is a deficient number, since it is larger than the sum of its proper divisors (9245971).

64721741 is an equidigital number, since it uses as much as digits as its factorization.

64721741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9245970.

The product of its digits is 9408, while the sum is 32.

The square root of 64721741 is about 8044.9823492659. The cubic root of 64721741 is about 401.4980099952.

The spelling of 64721741 in words is "sixty-four million, seven hundred twenty-one thousand, seven hundred forty-one".