64689487 has 2 divisors, whose sum is σ = 64689488. Its totient is φ = 64689486.

The previous prime is 64689479. The next prime is 64689563. The reversal of 64689487 is 78498646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64689487 - 2³ = 64689479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64689407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32344743 + 32344744.

It is an arithmetic number, because the mean of its divisors is an integer number (32344744).

Almost surely, 2^64689487 is an apocalyptic number.

64689487 is a deficient number, since it is larger than the sum of its proper divisors (1).

64689487 is an equidigital number, since it uses as much as digits as its factorization.

64689487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 52.

The square root of 64689487 is about 8042.9774959277. The cubic root of 64689487 is about 401.4313035665.

The spelling of 64689487 in words is "sixty-four million, six hundred eighty-nine thousand, four hundred eighty-seven".