64720927 has 4 divisors (see below), whose sum is σ = 66098016. Its totient is φ = 63343840.

The previous prime is 64720913. The next prime is 64720937. The reversal of 64720927 is 72902746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64720927 - 2¹¹ = 64718879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64720937) 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, 688474 + ... + 688567.

It is an arithmetic number, because the mean of its divisors is an integer number (16524504).

Almost surely, 2^64720927 is an apocalyptic number.

64720927 is a deficient number, since it is larger than the sum of its proper divisors (1377089).

64720927 is a wasteful number, since it uses less digits than its factorization.

64720927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377088.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 64720927 is about 8044.9317585670. The cubic root of 64720927 is about 401.4963267857.

The spelling of 64720927 in words is "sixty-four million, seven hundred twenty thousand, nine hundred twenty-seven".