64440757 has 2 divisors, whose sum is σ = 64440758. Its totient is φ = 64440756.

The previous prime is 64440751. The next prime is 64440763. The reversal of 64440757 is 75704446.

It is a balanced prime because it is at equal distance from previous prime (64440751) and next prime (64440763).

It can be written as a sum of positive squares in only one way, i.e., 43151761 + 21288996 = 6569^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 64440757 - 2¹⁹ = 63916469 is a prime.

It is a super-2 number, since 2×64440757² = 8305222325466098, which contains 22 as substring.

It is a Chen prime.

It is the 8028-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64440751) by changing a digit.

It is a nontrivial repunit in base 8027.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220378 + 32220379.

It is an arithmetic number, because the mean of its divisors is an integer number (32220379).

Almost surely, 2^64440757 is an apocalyptic number.

It is an amenable number.

64440757 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440757 is an equidigital number, since it uses as much as digits as its factorization.

64440757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 64440757 is about 8027.5000467144. The cubic root of 64440757 is about 400.9161438492.

The spelling of 64440757 in words is "sixty-four million, four hundred forty thousand, seven hundred fifty-seven".