64020909 has 16 divisors (see below), whose sum is σ = 87494400. Its totient is φ = 41620800.

The previous prime is 64020907. The next prime is 64020911. The reversal of 64020909 is 90902046.

It is an interprime number because it is at equal distance from previous prime (64020907) and next prime (64020911).

It is not a de Polignac number, because 64020909 - 2¹ = 64020907 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64020907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48559 + ... + 49859.

It is an arithmetic number, because the mean of its divisors is an integer number (5468400).

Almost surely, 2^64020909 is an apocalyptic number.

It is an amenable number.

64020909 is a deficient number, since it is larger than the sum of its proper divisors (23473491).

64020909 is a wasteful number, since it uses less digits than its factorization.

64020909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 64020909 is about 8001.3067057825. The cubic root of 64020909 is about 400.0435556738.

The spelling of 64020909 in words is "sixty-four million, twenty thousand, nine hundred nine".