64690789 has 4 divisors (see below), whose sum is σ = 67503456. Its totient is φ = 61878124.

The previous prime is 64690783. The next prime is 64690817. The reversal of 64690789 is 98709646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64690789 - 2⁵ = 64690757 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 (64690783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406299 + ... + 1406344.

It is an arithmetic number, because the mean of its divisors is an integer number (16875864).

Almost surely, 2^64690789 is an apocalyptic number.

It is an amenable number.

64690789 is a deficient number, since it is larger than the sum of its proper divisors (2812667).

64690789 is a wasteful number, since it uses less digits than its factorization.

64690789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812666.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 64690789 is about 8043.0584356947. The cubic root of 64690789 is about 401.4339967401.

The spelling of 64690789 in words is "sixty-four million, six hundred ninety thousand, seven hundred eighty-nine".