64020757 has 4 divisors (see below), whose sum is σ = 64039500. Its totient is φ = 64002016.

The previous prime is 64020751. The next prime is 64020779. The reversal of 64020757 is 75702046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58384881 + 5635876 = 7641^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 64020757 - 2²³ = 55632149 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 (64020751) 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, 2632 + ... + 11617.

It is an arithmetic number, because the mean of its divisors is an integer number (16009875).

Almost surely, 2^64020757 is an apocalyptic number.

It is an amenable number.

64020757 is a deficient number, since it is larger than the sum of its proper divisors (18743).

64020757 is a wasteful number, since it uses less digits than its factorization.

64020757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18742.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 64020757 is about 8001.2972073283. The cubic root of 64020757 is about 400.0432390758.

The spelling of 64020757 in words is "sixty-four million, twenty thousand, seven hundred fifty-seven".