64430020 has 12 divisors (see below), whose sum is σ = 135303084. Its totient is φ = 25772000.

The previous prime is 64430011. The next prime is 64430029. The reversal of 64430020 is 2003446.

It is an interprime number because it is at equal distance from previous prime (64430011) and next prime (64430029).

It can be written as a sum of positive squares in 2 ways, for example, as 41062464 + 23367556 = 6408^2 + 4834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64430020.

It is not an unprimeable number, because it can be changed into a prime (64430029) 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, 1610731 + ... + 1610770.

It is an arithmetic number, because the mean of its divisors is an integer number (11275257).

Almost surely, 2^64430020 is an apocalyptic number.

It is an amenable number.

64430020 is an abundant number, since it is smaller than the sum of its proper divisors (70873064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64430020 is a wasteful number, since it uses less digits than its factorization.

64430020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221510 (or 3221508 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 64430020 is about 8026.8312552339. The cubic root of 64430020 is about 400.8938759764.

Adding to 64430020 its reverse (2003446), we get a palindrome (66433466).

The spelling of 64430020 in words is "sixty-four million, four hundred thirty thousand, twenty".