64690289 has 8 divisors (see below), whose sum is σ = 65596608. Its totient is φ = 63790480.

The previous prime is 64690267. The next prime is 64690331. The reversal of 64690289 is 98209646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64690289 - 2¹⁶ = 64624753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64690229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20399 + ... + 23355.

It is an arithmetic number, because the mean of its divisors is an integer number (8199576).

Almost surely, 2^64690289 is an apocalyptic number.

It is an amenable number.

64690289 is a deficient number, since it is larger than the sum of its proper divisors (906319).

64690289 is a wasteful number, since it uses less digits than its factorization.

64690289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 64690289 is about 8043.0273529312. The cubic root of 64690289 is about 401.4329624995.

The spelling of 64690289 in words is "sixty-four million, six hundred ninety thousand, two hundred eighty-nine".