64407757 has 6 divisors (see below), whose sum is σ = 64720014. Its totient is φ = 64096920.

The previous prime is 64407697. The next prime is 64407769. The reversal of 64407757 is 75770446.

It can be written as a sum of positive squares in only one way, i.e., 61763881 + 2643876 = 7859^2 + 1626^2 .

It is not a de Polignac number, because 64407757 - 2¹¹ = 64405709 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 (64407257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73003 + ... + 73879.

It is an arithmetic number, because the mean of its divisors is an integer number (10786669).

Almost surely, 2^64407757 is an apocalyptic number.

It is an amenable number.

64407757 is a deficient number, since it is larger than the sum of its proper divisors (312257).

64407757 is an frugal number, since it uses more digits than its factorization.

64407757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419 (or 1148 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 40.

The square root of 64407757 is about 8025.4443490688. Note that the first 3 decimals coincide. The cubic root of 64407757 is about 400.8476960096.

The spelling of 64407757 in words is "sixty-four million, four hundred seven thousand, seven hundred fifty-seven".