64754721 has 10 divisors (see below), whose sum is σ = 96732482. Its totient is φ = 43169760.

The previous prime is 64754719. The next prime is 64754743. The reversal of 64754721 is 12745746.

64754721 is a `hidden beast` number, since 647 + 5 + 4 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 17969121 = 6840^2 + 4239^2 .

It is not a de Polignac number, because 64754721 - 2¹ = 64754719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64754321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 399640 + ... + 399801.

Almost surely, 2^64754721 is an apocalyptic number.

It is an amenable number.

64754721 is a deficient number, since it is larger than the sum of its proper divisors (31977761).

64754721 is an equidigital number, since it uses as much as digits as its factorization.

64754721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799453 (or 799444 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 64754721 is about 8047.0318130352. The cubic root of 64754721 is about 401.5661949960.

The spelling of 64754721 in words is "sixty-four million, seven hundred fifty-four thousand, seven hundred twenty-one".