64761489 has 12 divisors (see below), whose sum is σ = 100740276. Its totient is φ = 39853152.

The previous prime is 64761479. The next prime is 64761493. The reversal of 64761489 is 98416746.

It can be written as a sum of positive squares in 2 ways, for example, as 37638225 + 27123264 = 6135^2 + 5208^2 .

It is not a de Polignac number, because 64761489 - 2⁸ = 64761233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64761479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276642 + ... + 276875.

It is an arithmetic number, because the mean of its divisors is an integer number (8395023).

Almost surely, 2^64761489 is an apocalyptic number.

It is an amenable number.

64761489 is a deficient number, since it is larger than the sum of its proper divisors (35978787).

64761489 is a wasteful number, since it uses less digits than its factorization.

64761489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553536 (or 553533 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 64761489 is about 8047.4523297749. The cubic root of 64761489 is about 401.5801847370.

The spelling of 64761489 in words is "sixty-four million, seven hundred sixty-one thousand, four hundred eighty-nine".